Most consumer-grade locks aren’t that secure. To wit, if you ever need to open a basic padlock or combination lock without a key, all you need is a soda can, a boxcutter, and a little precise cutting.
As the video above from Howcast demonstrates, you can (carefully!) cut a small piece of metal out of an aluminum can that’s sturdy enough to pop open the mechanisms on padlocks and combination locks. Be forewarned, the technique above requires cutting sharp metal very precisely, so you’ll need to use extra caution with this method.
How to Pick Any Padlock or Combination Lock | Howcast
via Lifehacker
Pick a Combination or Padlock Using a An Aluminum Can and a Boxcutter