Have you ever gotten locked out of your bedroom or dorm room? It can be an even bigger problem (not to mention, an expensive one) if you decide to kick open or break your door down, so be patient and find another way to open it. While you may have heard about opening locked doors using a pin or a credit card, here is another ingenious way of achieving the same result from Instructables.
For this technique, you are going to need a piece of paper, dental floss, and a vacuum cleaner. The general idea is to get the cable of the vacuum cleaner to hook onto the interior knob on the door, allowing you to twist the knob and open the door from the inside. Click here to find out how.