Making keys ~ You're getting a tiny taste of what it's like to be a machinist or tool&die maker. The pleasure of creating something useful, or just cool looking, from a blank. Fun ain't it.
Running money orders ~ May be mindless but you can relax for a few seconds because you can do it confidently and not worry about fucking it up, like you might with the million other things you have little or no experience with.
Tilling money ~ It's amazing how recalcitrant money in the drawer can be. Depends on how worn the bill is, or maybe how much coke residue is on it. Then somebody throw a $2 bill or $1 coin at you.
You're taking to this like a duck to water, UT, good job.