@tsarstepan,
I think my first job was at a frozen yogurt place. It was not fun. I was already pretty far along in losing my hearing and it was one of those extra-custom places (but before they figured out the whole letting the customer do it part). So it wasn't just vanilla or chocolate, it was half vanilla, half chocolate, with walnuts and M&Ms and strawberries on top. A lot of things for me to mess up if I didn't understand, in other words.
I did OK-ish (not great, not terrible), but the brain power needed for such a stupid undertaking was immense, and I'd crash for hours afterwards.
And that's not even going into rude customers, annoying co-workers, and all the standard indignities of that kind of a job.
Plus the hearing issue (and the fact that I needed to marshal my resources to understand customers) meant that I didn't have the chance to engage with my co-workers at all, which is usually the saving grace in these kinds of jobs. (My next job, at an indie movie theater, was just as indignity-ridden and almost as tricky communication-wise but the co-workers were awesome and I liked it much more.)
I worked there one summer.