Tallman
Almost Self-Reliant
A friend of mine sent me the link below about a bump key. It is a key that has been altered to open 90% of all front door locks, and I think that the same principle will work on a padlock. 
http://www.youtube.com/watch?v=hr23tpWX8lM

http://www.youtube.com/watch?v=hr23tpWX8lM