How to Lubricate a Jammed Door Lock

Remove the lock from the door according to manufacturer directions and set it aside. Typically, removal involves turning a set of screws counterclockwise.

Spray the inside of the lock with a spray lubricant, such as WD-40. Turn the nozzle in different directions to apply a thin layer of lubricant over the entire internal workings of the lock. Spray a little lubricant inside the key hole as well.

Wipe off the excess oil with a rag or cotton swab to remove grime and the black residue of ground metal that sometimes cause the lock to be stuck. When the lubricant is applied, grime and the black residue loosen, making them easy to remove. Reapply the spray lubricant, if necessary.

Reattach the lock in the same manner as you dissembled it, making sure the assembly is held tight in its opening. Make sure the catch on the opposing door jamb is positioned to receive the bold or spring lock without resistance. Turn the lock to determine whether it works freely.