Like many other things, locks also occasionally require maintenance and repair. You should inform a professional locksmith as you notice some problem in your locks so that they can be repaired easily otherwise they will have to be replaced. Many times minor fault can become serious issue if not corrected in time.
Many people think of replacing the lock and installing new lock instead, however, It’s much cheaper to fix it than replacing and rekying the lock
In order to avoid further damage you can call a locksmith instantly. For instance, you must call a locksmith to repair the lock if you have broken the key in it.