Bad Service

I went to the Shoprite at Magaleni, Daku. A friend and I went to the liquor store to buy something. We were short so we went home, which is 5 minutes away, to fetch the extra money. When we got back the time was 19:50 but the security at the gate refused to let me back in, telling me that the shop was closed, whereas I could tell that the store was still open and there were people still coming out of the shop. If the closing time of this Shoprite is 20:00, then why are we being refused the right to purchase if there is still sufficient time? This man had bad service and a bad attitude. The date of this occurrence was the 07/04/2018. I was baffled by such behaviour.