Late Customers

I wonder why customers like to shop at the time when the shop is closing. 

It's already past our shop's closing time and these customers were still dilly-dally in choosing their stuff. I had to call out three times before they were willing to stop.

I said, 'Hello, we are closing.' No response. I had to say again and yet still no response. Finally, I had to go right in front of those customers and said again.

Then only they were willing to call it a night!