Just a guess - Security! Also, having someone walk in 1min to close means they have to stay open until they are gone. Those who are calling in, the rest of the staff can be doing closing duties around the baking pizzas(& deliveries).
But I'm still lost on why they close a couple hours early. I get walking in at the last minute. But trying to walk in at 8.30 when they usually close at 11. Just a no go
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