1. The blade lock key cannot be removed because the blades in the lock cylinder rotate slightly out of sync. You can turn the key back and forth to remove it.

2. The key of the marble lock cannot be pulled out. Please check whether the lock core is loose back and forth. If there is any looseness, please push the lock core in and pull out the key.

3. If the key is not locked in place, turn the key in the locking direction to the end to remove it.

4. The door handle is not turned in place to lock the door, just turn the door handle back and forth to lock the door in place