At my supermarket 5 minutes before closing time. Because the glory coin counters take time to clean/close, they close them ahead of time, so the self checkout lane has only one unit to use while all the human cashier are free

I personally hate the self checkout if it's one of those with the super sensitive scale where if a particle of dust lands on the item shelf, it then complains "put back the item on the shelf" and I'm forced to wait 2 minutes for the operator to unlock it. If I buy deli items It Always fails because it reads from the barcode it's 200 grams but with the package it is actually 210 grams