In the last hotel I stayed at, I arrived too late for dinner so ordered room service. As I was eating the door to my room opened and a man came in. They had given him a key.
At the last hotel I slept at 2 weeks ago, I was too tired to do all this but I remembered the chair trick & pushed the chair to the door. I was woken up by the sound of the chair being pushed because one of the hotel male staff was fidgeting with it to get into my room.