No respect for employees

Hi I work for the Food *****s Market as a cashier in Springfield Business park Durban. Just this past friday I was at work doing my usual job when the store got quiet and there where no customers by the cashier sections. I asked the supervisor if it was possible for me to get a few items from the back of the store for home, I was granted permission to do so. 10 minutes after getting what I needed the store owner walks up to me and in a very unpleasant manner begins to verbally attack me.. \Sharon I've been watching you for over 20 minutes now you wasting my time and your time GO to the front now just leave all those things!!!!\". I responded in a calm voice saying that I was there no longer than 5-10 minutes and asked him not to shout at me because I did nothing wrong. He then throws it in my face that he is the boss and will do whatever he wants whenever he wants and tells me to leave he's store. He then calls the supervisor and tells him to fire me he wants me gone!. I got family at home whom need to eat too, my tea time is way to short to get shopping done and it's to late after hours as well. This is not the first time his done this and now he has me on short time for a month."