Evening and part-time openings around St. Louis - what worked for you?

I am looking for part-time work that fits around school hours and found a few evening shifts near St. Louis. Shifts are four to six hours and the pay is weekly. Is the schedule really fixed?

Check how they treat part-time staff for benefits. Some add them after a set number of hours.

Ask whether the schedule is posted in advance and how they handle swaps. It matters a lot with kids.