Lockpickin is a dying art, but there is some pretty cool. Generally the way a lock works is that there are many pins inside the chamber that are attached to springs, that must be pressed in to a certain pressure, in order to disengage the lock and turn the barrel. This is done using a variety of tools, including rakes, picks, bump keys, and probably most importantly, a tension wrench. The tension wrench is used to, you guessed it, keep tension on the lock so you can tell when you have properly engaged all of the pins to the proper pressure. Rakes are used to engage multiple pins at once, and are generally easier to use, while picks and bump keys are more presice, only activating 1 pin at a time. After the springs have been compressed to the proper distance, a rotational force must be applied to the tension wrench in order to turn the lock, completing the picking process.