The same is true at other retail stores. So, what I did (at a different store) is offer as much flexibility as possible so that the bosses scheduled me 25-29 hours every week. Plus, whenever other employees called out, the bosses would call me, and I'd go right in. Eventually my work hours were 30-38 hours per week.
Still not enough $$$ to live on, but almost everyone there was working 2-3 jobs. Some earned much more money at their other job(s). And, a few were working just to work - they didn't even need money. When you see someone working in retail, it doesn't mean they're broke. Especially seniors, some of whom just enjoy working all day long, believe it or not.
When my grandfather retired & he & my grandmother moved to Florida he got a job at Public as a grocery bagger. He did not need the money, but he loved & missed his old routine of getting up, dressing nicely & interacting w/ people. He loved talking to people as he bagged & took their groceries to their car. He loved people & gardening.