A slave is a person which is simultaneously property. To all those that believe having a "shitty job" is slavery, may I ask you to identify the corresponding master/owner?
Its usually someone running a business, the usual suspect. If you are a wageslave you are fucked... not much margin of action. If you are not part of the initial distribution of the pie and your family didnt got a nice slice of the pie, then you'll need something special. Most people aren't and its difficult to break the wageslave loophole.
Hmm... What happens if a "wageslave" is fired? Are they then free?
This is discipline for disobeying.
Now they have to suffer, probably lose their apartment, rely on other people which stresses relationships, experience self-esteem loss from being temporarily (or permanently, in some lines of work) unable to provide for one's self, possibly go hungry/be subjected to a demeaning food-stamp program (not every city has soup kitchens, or well stocked food pantries, and not everybody lives in a city), all while having to go around filling out job applications and present their best self for job interview after job interview, selling yourself to a new master.
So, a master can punish a slave by setting them free. The free person will then want to find any new master that will have them.
Not sure the "slave" analogy is the right one to be honest.