The hole in the door frame is not big enough.

The lock hole of the security door can be opened, but the reserved size is too small. Fix the security door first, and then use a level to determine the levelness of the top, bottom, left and right. Next, it needs to be filled with cement mortar and then brushed flat.

Another method is to cast-in-situ a lintel plate, and remember to add steel bars in it until it is completely dry.