grocery is not a minimum wage job. It’s unionized (where allowed) and usually one of the best paying entry jobs before the recent shortage (another issue with unions…)
People can stay in the because they either move to better paying depts (like meat, bakery,etc) and because they generally are not solo income (spouse, etc).
long time grocery clerks were never paid great. Which is why the most senior always work the sunday and holiday shifts for the better pay.
i was the third generation working in grocery. Every male in the family worked grocery at least at some point. No one stayed a clerk, and most moved onto skilled and higher paying jobs. My grandfather sold his store and worked in a chain as a butcher after moving to the suburbs. His parents worked picking vegetable fields.
people worked harder and had less.