Turned away for useless reasons

I went to the Standard bank branch, I arrived there exactly 15:10 on the 02nd December 2021 and the security guy told me that they have cut the line.I insisted on getting inside and he blocked me. Imigine the petrol I used to go there only to be turned away.The operating hours are from 09: - 15:30 week days. I'm wondering if they use this kind of behaviour because the branch is in the middle of the township or they just doing this because most of the client getting services there are black. I wouldn't blame the security guy as such because I know he receive orders from the management. Clearly they don't care about their client.