Traditional Culture Encyclopedia - Hotel reservation - What if you feel uncomfortable because the hotel is not locked?

What if you feel uncomfortable because the hotel is not locked?

I feel uncomfortable because the hotel is not locked. How to communicate with the hotel waiter to help them find their way or block the door with something particularly heavy? Therefore, when someone knocks at the door, I will hear that I can relax properly, because I will stay in the hotel for only a few days, and I believe I will go home soon.