There may also be some issues in the lock
The through spindle can be broken, so the actuation handle does not send any information to the latch. This is because the partial chain of interaction has collapsed. In addition to the spindle, there may be a problem with the spindle hole. If you see a problem with the cylinder with the key, there may be a problem with the tailpipe of the lock cylinder. There may also be some issues in the lock. There are also several small pieces in the lock that may have broken, which may reflect some other possible diagnostic effects.