On last Friday (12 March 2021), I was there around...

On last Friday (12 March 2021), I was there around 5:45pm. Then, I lined up to make my order. When the customer who was in front of me, completed ordering. Then, I started to order, the front desk staff had not said anything to me, just point at the sign "Closed". And at the same time, 5 or 6 customers were lining up after me.
I was thinking that did I go there after the business hour. I don't think so, other shops in the food court were super busy for taking care customers. Closing at 6pm on Fridays, does it right?
I also found that all staff who working there are Not happy all the time. It seems that they have a lot hard time from their boss or top management. I will not suggest anyone to buy food from there. Although their food is with good taste, if no service means Nothing !