A business did that to me when I was young. They had me come in for a “working interview.” Then the next three days work for pay. Then they dropped me from the schedule without telling me why. I had to call the owner/manager/whoever the fuck and he told me “we don’t see you learning this job quick enough so we decided to not go further.”
Small business owners can be even worse people to work for. Don’t let that shit fool you.