Need quick engaging activities for that awkward 10 minutes before dismissal

The last 10 minutes of our kindergarten day is my nemesis.... Backpacks are packed, we're waiting for the bell, and 22 five-year-olds have absolutely lost the ability to sit still or listen. If I let them play freely, they wind up so high that dismissal becomes mayhem. I've been relying on GoNoodle videos but my teacher mentor said I'm using "too much screen time." I need simple activities that: 1) require zero prep or materials since everything's packed up, 2) keep them engaged but not hyper, 3) can be dropped instantly when parents arrive for pickup. Yesterday I had them doing breathing exercises (thanks Wim Hof) and one of my kids literally fell asleep standing up. Any suggestions to bring order back to pre-dismissal chaos?