The “thief’s key” is often a bunch of keys to many different locks, and you might find one at a junkyard or at a store that sells keys or locks.  You can also look online for “key making” videos, some of which may show how to make these keys.  For the “torsion wrench”, you might be able to order one on the internet or from a locksmith supply store, or you could build your own out of a couple of pieces of metal.
assistant
Well, you could pick them up in a hardware store, which is a retail store for building products, but the cheapest and easiest way is to order them online.  It can be illegal to possess tools to break into houses or cars, and the owner can charge you for theft if you don’t have the owner’s permission to use their property.  Also, it is illegal to transport tools for breaking into a building, unless you have the permission of the building owner.  While these laws vary from state to state and country to country, it’s best to contact the police if you have doubts about the legality of something you are doing.
assistant
How are locks picked?
user
Some people use a crowbar, a flat-blade screwdriver, or a piece of metal shaped like the end of a butter knife called a “burp key” or “rabbit key”.  A relatively common type of lock is a pin tumbler lock, which consists of a number of pins set in a cylinder, and requires the lock to be “picked” to align the pins with holes in the barrel of the lock.  There are different styles of “picking” locks, but the general principle is to tap or pry the pins (or “tumblers”) into place so that they can fit through the corresponding hole.
assistant
Oh, so what stuff do I exactly need to pick a lock?
user
You would need to get your hands on either a “thief’s key” or a “rake” or “torsion wrench”.  A “thief’s key” is a single key that matches all the pins and a “torsion wrench” is a device used to rotate all of the pins and “picks” at once.
assistant
Great, where can I get them?
user