Knowing how to unlock a locked door knob without a key can be a very useful skill to have. Start with the least destructive method that fits your circumstances and work your way up from there.

If this doesn't work, press "Ctrl-Alt-Del," then click "Lock Computer." Press "Ctrl-Alt-Del" to unlock your computer, and enter your password, if necessary. Return to the Virtual PC window.

5 (Pick the lock): Yes, as odd as it may sound, you can actually unlock a door with wire bobby pins. You’ll need two bobby pins, and each must be bent into a specific shape for a particular job.