Key Turns But The Door Won’t Open — What’s Wrong?
If the key turns all the way but the door stays shut, the cylinder has done its job and something after it has failed — a sheared tailpiece, a disconnected spindle, a bolt jammed in the strike, or a second lock you have forgotten is thrown. The good news is the pins are fine, so this is rarely a drilling job.
This one confuses people more than any other fault, because the key behaves normally. It goes in, it turns, it turns back. Everything sounds right.
And the door does not open.
What has happened is that the lock has split into two halves that are no longer talking to each other. The cylinder turns. The bit that moves the bolt does not.
Narrow it down by what you can hear
| What happens | Likely cause | Drilling needed? |
|---|---|---|
| Key spins loosely, no resistance at all | Sheared tailpiece or cam | Usually not |
| Key turns, you hear a click, bolt stays put | Bolt jammed in the strike | No |
| Key turns, handle does nothing | Spindle disconnected or broken | No |
| Turns partway then stops dead | Bolt binding under load | No |
| Everything works but the door won’t move | A second lock is still thrown | No |
Check the obvious one first
More often than anybody admits, the deadbolt is unlocked and the handle latch is not, or there is a secondary lock — a nightlatch, a patio bolt, a flush bolt on a double door — that has been thrown and forgotten.
Doubly true on doors you rarely use. Side doors, garage doors, the one onto the patio.
The spinning key
A key that turns with no resistance whatsoever, round and round, has usually sheared its tailpiece. That is the flat bar at the back of the cylinder that reaches through the door and actually moves the bolt. It is soft metal and it is the deliberate weak point in a lot of hardware.
Why it goes: months of being turned against a bolt that was binding. Same root cause as most things on this site — the door moved, the bolt started catching, and something eventually gave. It just happened to be the tailpiece rather than the key.
Replacing a cylinder is straightforward and does not usually mean a new lockset.
The jammed bolt
If you can hear the mechanism working but the bolt will not withdraw, it is trapped in the strike. Take the weight of the door — lift it slightly by the handle, or push it firmly towards the hinges — and try the key again. Very often it frees immediately.
That test is also the diagnosis. If lifting the door releases it, the frame has dropped and the bolt is under load. Fixing the strike alignment stops it happening again, and there is a full walk-through in why won’t my door latch properly.
Do not do this
- Do not keep turning. If the tailpiece is half sheared, the rest of it is about to go, and a fully sheared cam is a harder job than a cracked one.
- Do not shoulder the door. A bolt jammed in a strike will take the frame apart before it gives.
- Do not go for the hinges unless you are certain they are the removable kind and you have somewhere else to be for an hour.
Why it happens more here
Same reason as most of it. The metro is sinking between 0.2 and 0.8 inches a year and slabs do not go down evenly, so frames rack and bolts bind. A binding bolt puts every turn of the key through the tailpiece, and soft metal only takes so many.
Add salt corrosion inside the mechanism and a hardware failure that would take twenty years elsewhere takes eight here.
Can you get in without damage?
Usually, yes. The pins are undamaged in every one of these scenarios, so the cylinder can normally be manipulated or the mechanism reached without drilling. Drilling is a last resort and it is worth asking anybody you ring whether they expect to need it — an honest answer is “almost certainly not, and here is when I would”.
If somebody leads with drilling, that is worth a second thought. There is more on that in how locksmith scams work.
What to tell us if you ring
Whether the key spins freely or meets resistance, and whether lifting the door changes anything. Those two facts alone usually identify the fault before anyone arrives. Ranges are on the prices page, and if it turns out the hardware is done, lock grades explained covers what to replace it with.