Open at 11, lunch at 12?

I find some of the local banks operating hours very unique and seems like it was not designed to be customer focused.

Common sense will tell you that if the bank opens at 11am for customers, the staff within should have already taken lunch before the bank is open. It does not make any sense to open the bank at 11am, where a long queue has already formed outside, and then later go for lunch at 12pm when the bank is full of customers.

Does it make sense? Apparently the local banks here think so. Wonder if this is some new management theory.