Forcing it could break the key in the lock.
House back door wont lock.
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Most interior door knobs are relatively inexpensive to replace.
Cold and freezing weather will cause a upvc door to not lock or close properly this is due to contraction of the upvc the shrinking can only be 1mm o r 2mm but is enough to stop your door from locking.
Faulty lock the internal mechanism could be broken.
Slide the key in the lock and tap lightly on the key to lubricate the inside of the lock.
Spray the door key with a graphite based lubricant.
Place a block plane on the outside edge of the door nearest to where you marked the problem area.
Shut the door and try to lock it.
Outdoor locks can collect a lot of dirt and dust inside the lock cylinder.
If that is the problem it is easy to fix.
How to fix a door that won t close because of settling by heath robert.
If it won t lock open the door.
For serious lock problems it is usually best to call a locksmith or to replace the lock entirely.
Debris or ice from cold weather may be causing problems with the cylinder or you might simply be using the wrong key.
Take the door off the hinges.
You can spray a little dry lubricant in the lock to free up the plug so you can open the door.
Insert a long sturdy item with a flat tip preferably a flat head screwdriver if available between the top rung of the door s top hinge and the head of the bolt securing the door to the hinge.
Cold weather upvc door lock won t lock or shut properly.
Key is hard to turn or won t go in the lock don t force the key.
After each pass hang the door on the hinges and close it to test the fit.
It doesn t really pay to have interior door knobs or locks professionally repaired unless they are special.
It s possible that there is an issue with the lock cylinder.
The bolt on the door would not go across in a dream.
If the door does not allow the lock to be jimmied open it may be necessary to remove the door from its hinges.
Flip the key and open the door.
Place the door stop back on the jamb.
To be unable to lock a door in a dream can suggest that you are trying to hide from problems in life.
Tap the end of a chisel under the door stop on the striker side of the jamb.
Firmly push the plane toward the center of the door to shave off a small amount of wood.
An improperly functioning latch may be the result of a poorly fitting door.
Set it back.
I have wrote quite a bit above but this section is the detailed dream lore of not being able to lock the door.