1. Carefully observe the structure of the door. (If you have the same cabinet or door, you will have the key, then you will be lucky). Will flatten the knife. Insert the lock empty, and force the direction of the door to open normally, mostly in a clockwise direction. After a few activities and back and forth activities, the metal filing cabinet is not a safe after all, and most of them can be opened at this time. If it is locked or not, you'd better hit a large flat knife. This will open it with maximum force.

 

2. Look at the lock cylinder of the file cabinet. Carefully observe how the door is locked, and then manually knock it. For the purpose of opening the door when knocking, it is best not to damage the cabinet.

 

3. Use the electric drill to drill through the lock cylinder slowly. Note that the cabinet is easily deformed. Consider the reuse of the metal file cabinet after opening. You should slow down. After opening, lock up the city or hardware store and find the lock to change.