Yup...
Tis true to an extent - varies depending on role etc...
well...no. to quote wiki
Slavery is a system under which people are treated as property to be bought and sold, and are forced to work.[1] Slaves can be held against their will from the time of their capture, purchase or birth, and deprived of the right to leave, to refuse to work, or to demand compensation. Historically the institution was called "slavery" and was accepted by societies; in more recent times slavery is not acceptable, but conditions tantamount to slavery although not called such continue, with debt bondage, indentured servitude, serfdom, domestic servants kept in captivity, adoption in which children are effectively forced to work as slaves, child soldiers, and forced marriage
all of which does not apply even in a rubbish office job.
just call it prolonged work experience or national service, which is essentially what you are suggesting.