In a true shtf situation there are many scenarios where you may need to open a padlock. Most padlocks can easily be opened with a hammer or crowbar but these methods can attract unwanted attention. This excellent video below by Its Tactical shows you how to make a simple shim from a coke can that can be used to open two of the most common types of padlocks.
Lock picking is and excellent skill to have in a shtf situation so check out the video below and make a few of these shims to keep in your kit. Please remember this site does not condone criminal activity and these skills should only be used in a true shtf situation.