What if the alternative to these jobs is not other jobs, but no jobs? If working in such a job is considered slavery, then most of the west also employs slaves

What if the alternative to these jobs is not other jobs, but no jobs? If working in such a job is considered slavery, then most of the west also employs slaves in the form of "simple, low skilled" jobs, such as cashiers. Many people don't have many options, and losing even such a job could mean unemployment.