Summarize the following:
Pick a ballpoint pen with an exterior the same diameter as or slightly smaller than the lock's opening. Remove the ink tube from inside the pen, as you will be using the ballpoint pen's exterior to jimmy open the lock. The notches should run up and along the sides of the pen. These will keep the pen flexible as they slide into the lock. Insert the pen as far as it will go into the lock, using pressure if needed. If the lock seems jammed and will not allow the pen to slide in, try either making the notches longer or cleaning any potential dirt or rust inside the lock. Hold the pen in one hand and the lock in the other and shake both from side to side until the pins loosen. If you hit all of the pins, the lock should open. Try shaking it several times—if it doesn't open after repeated attempts, you may need to use a lock pick.

Summary:
Cut off the end of a ballpoint pen with scissors. Cut 4 vertical notches into the back of the pen. Slide the pen into the lock's opening. Shake the lock back and forth.