I was in a very similar situation to you a few years ago when I went to university. I had a summer job working in PC World before I started, and I was lucky enough to transfer to the shop in my university city. I worked Wednesday evenings for 4 hours (16:00 to 20:00) and Saturdays (09:00 to 18:00) which gave me 12 hours income a week at a little above minimum wage at the time, or about £300/month. Essentially, it paid my rent and my student loan could cover everything else. Later when I entered my honours year I dropped down to just Saturdays.
The job was shitty in the sense that you had to try to sell junk computers and software and insurance to unsuspecting people for what felt like long hours and not much money, but I feel like the experience was ultimately worth it in many ways. I gained a work ethic, having to get up and be on time, wash and iron a uniform and take responsibility. I learned what it was like to be someone working there full time (and how it can destroy your soul). Again, for some people these jobs are all they can get. I also learned about the attitude of the average member of the public, which I think has given me some small insight into recent election results. I've got 5 years experience in retail sales in a complicated field (not just selling coffee or clothes) to put on my CV, which shows to employers in my profession that I have actually had what some call a "real" job, and all the life experience that goes with it.
I think it's worth judging a sales/delivery/misc job at such an early stage in your career as beneficial life experience, instead of only trying to find something relevant to your future career (if you can find a job that has both, though, then great!).