Still closing store before hours of trading

They doing it again. It never stop! Customers are being blocked to enter the store from 19:30.managers hides in their offices and avoid coming into assistance. I was at their door at 19H40 when people were standing outside wanting to enter the store. I personally knocked at the door for acess and was denied. The reply was rude form the security personnel even though warned that I will complain . I was initially told by the security lady that even if is 19H40 they must close the door for trading and there is nothing I can do about it. I then requested to see the Manager and was completely ignored as if there was a mad man at the door. Does this store really cares about customers? I even told them that I am going to complain but no interest was shown in whatever I was saying. They just don't care! I reported the matter before, hoping things will improve but it was just a moment disguise. Please consider this being a convenient store and only the store around the area, rather an excuse we always getting from the security personnel that the trains are leaving them. May be get the security that can manage times of trade in your store.