You won't get in
You wear a mask when walking in. When sitting at your table, you take you mask off. If you have to get up, you wear your mask. It's a good policy, and it's common courtesy. Same as coughing into your elbow or covering your mouth when you sneeze.
I don't work there that would be something you would have to ask the manager or whoever is in charge. We wore masks entering but obviously not while eating and all the staff were wearing masks. And I'm pretty sure it's mandatory to wear masks when going to stores. Whereas restaurant you wear them while entering but not while you're eating
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