Sometimes the obvious does make sense. I-Hacked.com shows how to do some office lock-picking if you see a key laying out in the open. Snap a picture of the key along with something to provide scale, cut the outline of it out of an aluminum soda can, insert and open! (I think I’d add a tension wrench which can also easily be made from common office items, for instance a paper clip or the clip part of a pen.)