I would imagine most restaurants right now would take the help for the dinner rush as a line cook, bartender, or even doing dishes. Other than that stores at the mall close by 9 (most workers gone by 9:30, 10ish at the latest) and many of them are hiring although some might just be seasonal.

GSB Arena and their food vendor might be hiring for basketball season, and most of their games are after 5 and let out by 8 or 9pm but it’s not very consistent. Hammons Field might be another option in the spring for baseball games doing similar work.

I’d also check out some temp agencies and the school district for various part time janitorial work as some other mentioned.

Good luck!