The very non-pc objective of these kinds of jobs is that not only you gain working experience but............it is also to hate it.
Hate it so much that finishing your education and graduating so you will not do those jobs ever again. When I was 17, I worked for Subway and 18 summer, McDonald’s. The final straw probably for me was when this girl I had a crush on walked in to my store (of all the McD’s in the entire freaking city) and noticed me, and had that sorry look in her eyes.
I had that experience too. I told her that I'd have money for college thanks to working two full time McJobs in the summer, and she was unimpressed. She took that as I wouldn't have much to spend on her, and I was surprisingly okay with the rejection. Any girl who thinks short term "how much can he spend on me today" might be fun to look at, but she's not a keeper. I earned my degrees, earned far more money than she could ever have imagined, and I've seen her a few times since. She still looks like an aerobics instructor and now she's interested in me, but I'm no longer on the market - and I'm grateful that, as a teenager with no more than the usual level of common sense, I dodged that mistake and chose not to pursue.
Kinda like prison. :)
In my opinion, it also functions as a test for better things. This job is a gateway job. If you come in as if this job really matters and perform like the job really matters, at some point, somebody is going to notice and give you a step up.