(the pictures are from different doors because my camera is acting wack, but you should get the idea)
Step 2: Slip paper over the top of the doorway
Step 3: Lower paper
Step 4: Grab paper
Step 5: Tie floss to vacuum cable
Step 6: Push cable underneath door and pull on floss
Step 7: Open the door
Step 8: Disclaimer
for example just looking at the door knobs around my house it won't work with a doorknob that doesn't turn when its locked and if you have stuff hanging on the back of the door it may block the floss and paper from going down or from the cable coming up. also some cables may be too smooth to grip the doorknob.
please don't use this to break into peoples rooms. your just going to get caught, it takes several minutes and is very obvious.
thanks for reading though, this is my first Instructable so please give constructive criticism. but i thought that the world needed to know how to open a door with floss, paper, and a vacuum. thanks for reading!!