Do the police knock or ring the doorbell when arresting people?

The police won't break into houses when they catch prostitutes. I worked as a receptionist in a hotel for a while, and I saw the police catch prostitutes. The general procedure is that the police follow the lady or client to the hotel, see which floor they go to, enter the room, then go to the front desk to watch the monitoring, let the waiter take the room card upstairs, and the waiter knocks at the door. He opened the door with MasterCard if he didn't open it, identified himself if he didn't open it, and then went in to arrest people.