Repair - Jammed latch
Repair - Since the latch is stuck due to rust and other material jams, it is best to remove the lock and clean it. The clay can be separated from the metal by completely immersing the component in vinegar having an acidity of about 5%. In old houses, rust removal is common and you may see many mortise locks. If there is enough time, it will affect all the locks, but after about a day in the vinegar, the locks can be wiped and polished, which will make them look brand new.