exit lock after a period of time, there will be difficult to open the door when the phenomenon caused this problem is because of their weight or loose-leaf doors reason some doors, and the doors leading to the sinking. In this case the door, lock the door will be very difficult. Under such circumstances do not force twist the key, this key may appear snapping phenomenon, but increased the trouble.

Faced with recurring problems above, we summarize some of your solutions, and this is the best way in practice many times after, I hope you resolve export lock open, poor shut problems.

The right solution: should review the reasons. If it is loose because of loose-leaf doors leading to the sinking, should be loose leaflet screwed tight. If the frame deformed or cause unrecoverable, starting from the door frame, the corresponding expansion bolt, so that the door lock switch exports can resume normal fluent.