Barricade a Door

1. Jam a wooden or metal chair under the doorknob. The chair will lean back with its front feet in the air. Jam the back legs of the chair back as far as you can to ensure the chair will not move.
2. Hammer wooden or rubber wedges under the door. Hammer some into the area around the doorknob as well. Hammer them down until they can go no further.
3. Move a large and heavy piece of furniture in front of the door. As with steps 1 and 2, this technique works if the door opens inward, towards you. Place the piece of furniture as close to the opening of the door as you can. Most people try to block the whole door, but right below the doorknob is the area that really counts.
   
4. Tie a rope or cord around the doorknob you want to keep shut. Tie the other end of the rope to another doorknob in the room. This will only work if the door you are trying to keep shut opens away from you. Tying this rope from one doorknob to the other gives the door an anchor. You can also anchor the door to another stable structure like a beam.
   

This seems like it would only work if people didn't really really want to get in. Additionally, the place where we live, currently, is on the 2nd of 3 floors with apartments above and below us. If those people really wanted to get in, they could come in the side windows, which are close enough to the neighbors to touch the other buildings, or come through the f-ing floor. We may have to move.