Guide
Why Your Key Will Not Turn, and What to Do Before You Force It
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Work Out Which of Three Things Is Happening
Three complaints get filed under a stuck key, and they are not the same: the key will not go in, it goes in yet will not turn, or it turns and then will not come out. Name yours first, because each sends you down a separate path. Entry trouble suggests the blade or the keyway. Turning trouble suggests the key, the cylinder or the door. Removal trouble suggests the plug has not returned to rest.
The Key Will Not Go In
Usual culprits are a key for another lock, an obstruction in the keyway, ice after a cold night, and a bent blade.
Key Goes In but Will Not Turn
Usually one of four things: pins the key can no longer lift correctly, a lock that is dry or worn, a uPVC handle left down, or a bolt pinched by the door.
When the Key Turns but Will Not Come Out
Pins release the blade only with the plug at its resting position, so the key has usually stopped just short of it.
| Experience | Usual cause | Next step on this page |
|---|---|---|
| The key meets resistance at once | Obstruction, frost, bent or wrong key | If the lock has frozen |
| The key sits in but the plug is fixed | Handle down, key worn, cylinder tired | Test the spare key |
| The key turned but is now trapped | Plug short of rest | The key turns but will not come out |
Anyone holding half a key has one that has snapped rather than stuck, and the broken key guide covers that.
On a uPVC Door, the Handle Must Be Lifted First
Here is the one sentence most worth reading on this page: on a uPVC or composite door with a multipoint lock, the key will not turn until the handle has been lifted all the way. Close the door first, lift the handle until it stops, then turn the key, and in that order the key usually moves easily. A handle that only goes up part way is a different matter, and the next heading deals with it.
Why Until the Handle Is Up the Key Cannot Turn
The handle sits on a square spindle that runs into a gearbox in the edge of the door. Lifting it drives the gearbox, which slides the locking points out along the whole height of the door. While the handle is down, the gearbox stops the cam on the back of the euro cylinder from rotating, so the key cannot turn however hard it is pushed, and it should not be pushed.
The Door Rather Than the Handle: When It Is
Open the door and lift the handle again. If it now travels all the way, the door is out of alignment with the frame and the mechanism is not the culprit. If it still jams, the gearbox may be the issue, which the uPVC mechanism problems guide explains.
Close the door. Lift the handle fully. Turn the key.
Test Using the Spare Key
Find the spare before anything else, because the result is clear: if it turns and your everyday key does not, the lock is fine and the key is worn. Two keys, one lock, and the difference between them is the diagnosis.
What Each Result Means
It turns. The cylinder still accepts a key cut to the right depths, so your daily key has lost enough metal that its cuts no longer raise the pins to the shear line. It does not. With both keys failing alike, the lock is where the fault sits.
Why a Working Spare Is Not the Finish
A lock that has worn one key keeps wearing the next. The spare has shared that lock for years, so it is rarely as fresh as it looks. Retire the worn key now rather than nursing it along, because worn keys are the ones that snap. To confirm wear, line it up against a newer copy: the cut peaks will be rounded rather than sharp, and the blade noticeably thinner.
The Right Thing to Lubricate It With
Graphite or a PTFE-based spray, made for locks and dry once applied, is what a stiff lock needs, and a general-purpose oil is what it does not. Here is why the difference matters.
A dry lubricant leaves nothing tacky behind, so dust has nothing to stick to. An oil leaves a film that catches every particle, and that mixture of oil and dust gradually turns the keyway into something closer to glue. The lock that loosened beautifully with oil this week can be the one that seizes later. Oil has a cold-weather drawback too: it thickens as the temperature falls, so an oiled lock can be stiffer on a frosty morning, not freer.
Applying it properly - Use a small amount in the keyway. - Slide the key in and out, then turn it several times to spread the lubricant over the pins. - Wipe the key clean when you are done.
If you are back where you started within a few days, the lock is worn and lubricant will not cure it.
The Lock Has Frozen
When the temperature drops hard, a lock can ice up internally even though the outside looks perfectly dry, and the result is a key that will not enter or will not rotate. If it happened overnight in cold weather and the lock behaved normally yesterday, frost is by far the likeliest explanation.
Why Boiling Water Will Make It Worse
Start with what not to do, because it is what most people reach for. Boiling water does melt the ice, briefly. It also floods the keyway, and once it cools it freezes again around the pins, now with more water in there than there was before.
How a Lock Can Be Thawed Safely
A lock de-icer, sprayed sparingly into the keyway, is the safe remedy. Warm the key in your hands as well, then ease it in and try a gentle turn. Never put the key in a flame, which harms the blade and any plastic grip. If nothing moves, give the de-icer more time instead of more force, since forcing a frozen lock snaps keys. Afterwards, treat the keyway with a dry lubricant so the moisture has less to cling to.
Here Is Exactly Why You Should Never Force It
Pushing harder on a key that will not turn is the quickest way to snap it, and a snapped key turns a problem you could have solved for nothing into one you pay to have solved. That is the reason behind the rule, and it is worth remembering on a rushed morning.
A key blade is a thin strip of brass or nickel silver. Its job is to carry a light twist into the plug, not to act as a lever, and years of use have usually made it thinner than it was. Extra force from any tool, or simply from a hand that is determined to win, goes straight to the narrowest part of the blade.
When people force it 1. The lock has frozen and it is cold out. 2. The door has swollen or dropped in summer heat and binds on the bolt. 3. The key gets halfway round and stops.
All three have a free answer earlier on this page. When those are used up, call someone rather than turning harder.
The Lock, Looked At
Let us know which of the three things your key is doing, whether your spare behaves the same way, and what the door is like when it is open; with those answers we can usually tell you the fault on the call. Having run the checks above is a head start, not a wasted effort.
What Helps on the Call
The three answers, plus whether the door is uPVC, composite or timber.
What You Can Rely On
No call-out charge. Calls taken 24 hours a day, 365 days a year. A price on the call, worked out from what you describe. DBS-checked technicians and public liability insurance.
Describe What the Key Is Doing · 01252 493213 Rather message than ring? Call or message Wilds Locksmiths Farnborough from the contact page, and if you are shut out rather than stuck, the page on getting back in if you are shut out is the better starting point.
Key and Lock Questions
Why will my key not turn in my uPVC front door?
Raise the handle fully, then try turning the key. For the majority of composite and uPVC doors, this lifting action operates the locking points and allows the key to turn. A partial lift may leave that sequence unfinished, even though the handle has already moved upwards.
Is it safe to use WD-40 on a lock?
Temporary relief is possible; lasting improvement should not be assumed. WD-40 will often free a lock that feels stiff, while oil-based products draw in dust. Over time, that dust and oil mixture can gum up the keyway, so judge more than just how the key turns straight afterwards.
My key goes in but only turns halfway. What should I do?
Do not push past the halfway point. Stop the attempt and avoid repeatedly turning the key against the same stopping point. When arranging help from a qualified locksmith, give the simple sequence: the key can be inserted, begins to turn, then stops before completing its movement.
How do I get a key out that will turn but not come out?
Start by easing the key back to its upright position. Removal is possible only once the plug has returned to rest. Turning and withdrawing are separate movements here: first bring the key gently back upright, then check whether it will come out of the lock.
Can I pour hot water on a frozen lock?
No hot water should be poured on the lock. If that is the method being planned, pause before going ahead. When seeking help, tell a qualified locksmith that the lock is frozen and explain whether anything has already been tried to deal with it.
How can I tell if my key is worn out?
Start with a side-by-side check against a newer key or the spare. Compare their appearance directly instead of trying to remember how the older one used to look. Keep both available if you need a qualified locksmith to help assess the suspected wear.