As for the hangers, you can use them to make a second lock on your door. Keep the door handle and latch between the hangers, or, if they are too far apart, connect two hangers together by placing one hook in the corner of the other, and placing the free hook above the latch and the opposite corner above the door. This will help you feel safe while you sleep and prevent criminals from entering your room by unlocking the door.
For protection, keep a washcloth or small towel in the latch. This will prevent anyone with a wire or any other device that could enter the door opening from doing so, protecting you while you sleep.
You can also install a roller under your door; carpet friction will help prevent potential intruders from opening it. In the morning, remove the paper that touched the floor and use it for its original purpose.