I heard you can make a copy with tin foil, gelatin, and putty?

It is possible to do all of these things, but just like bumping it is not much to worry about. In order for all of these methods to work, there is other extremely uncommon and difficult to produce materials needed. Some of these techniques require an existing working copy in the first place, so unless you are handing your key to random strangers… why worry? A hardware store copy is infinitely easy to come across!… and no… a master that fits all locks, simply DOES NOT exist! If it did, locksmiths would use it versus picks to unlock homes!