The unexpected guest riddle

BPL BIBLE

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A lady staying in a Blackpool B&B was about to go to bed when she heard a knock at the door.  She cautiously opened the door to find a man standing there.  She asked the man if she could help him, to which he replied “oh sorry, I got the wrong room, mine must be further down the hall”.

Uneasy, the woman closed the door, turned the lock and phoned hotel security.

Why did the woman feel so worried that she would call security?