The padlocks that secure most of America's high-school lockers are one of the easiest types of locks to open in the world for thieves and other miscreants. The easiest, cheapest way to do so is using a shim. These can be bought online, but why both when you can make one yourself out of an old soda or beer can? This video features a professional lockpicker at a conference explaining exactly how to make your own can shim and use it to open any padlock. You little devil you.