Unlocking the door chain in the room

"There are people inside, but the door chain is locked."

The client seems to be a daughter.She went out, but when she opened the door with her key, the door chain was hung from inside.It's like her bedridden mother who locked the door chain.Even though she was bedridden, she seems to have hung a persimmon tree this time.But she said she was inside but couldn't hear it.It seems that it is okay to cut it, but it usually ended with unlocking.