Don t use a wet.
Home front door lock wont unlock at all.
Remove these screws unscrew one side of the door knob and pull the door handle and lock assembly out of the door.
Flip the key and open the door.
If that is the problem it is easy to fix.
A strike plate is usually affixed to the door jamb and facilitates the extension of the bolt or latch.
Spray the door key with a graphite based lubricant.
If the key turns but doesn t unlock the lock disassemble the lock so that you can be sure the cam or tang is properly engaged with the bolt.
Lubricate the moving components with graphite then replace any broken parts and reassemble the lock.
In most cases it means that the latch or locking bolt are not lining up with the door locks strike plate.
The door could be misaligned so that although the door can be unlocked while the door is ajar when closed the door cannot unlock.
Remove the old lock.
That can cause the pins to get stuck in a partially raised position and prevent the plug from turning.
Slide the key in the lock and tap lightly on the key to lubricate the inside of the lock.
Locate the screws holding the lock in place on the inside of the door.
The lock cylinder may be broken so that you cannot use your key or anything else to move your door lock into the unlocked position.
This video shows how to disassemble and lubricate a basic cylindrical doorknob.
The same solutions apply to when you are solving the issue with most broken locks.
Outdoor locks can collect a lot of dirt and dust inside the lock cylinder.