What's the easiest job for shy teens with no job experience?

I recently tried this kitchen job at a sandwich shop for one day and they told me I was too slow and that they needed someone with more kitchen experience. They knew I had never worked a job before and had no experience before joining them that day and obviously, I was not going to go fast when they have over 100 dishes and recipes that I am not going to know on my first day. Also didn't know how to use all their machines properly but they did try to teach me and I was able to properly use it by the end of the day. I don't think it was that big of a deal because there weren't a lot of clients that day. Although they didn't pay me for my 6 hours of standing and working they gave me food so I guess it wasn't that bad. But I need to find another job so if y'all have any suggestions please leave some below. I am also very shy so I prefer not to be working with the general public as the main thing in whatever job I do.