(USA)Are you open?

We closed at 9pm today for system maintenance. There's a sign on the front door and at the speaker. The lanes are blocked with traffic cones. People kept coming up to the second window, sitting there and staring at me til I open the window.

"Are you open?"

"No, we closed at 9 today for maintenence, sorry."

So I put another sign on the second window. They're still sitting there waiting for me to talk to them. They're also calling.

Is it really that hard of a concept? 🙄