Actually, most probably have it WORSE than Slaves did.
Slaves at least got fed and were provided housing..
Now you can work 80 hours a week, and have to buy your own food and housing. Miss a payment and the banks will take your house. Fail to pay the property tax and the State will take your house.
When the crops weren't in season (winter time) slaves basically were on vacation to do what they pleased. American workers typically only get 2 weeks off at most.
Granted slaves had zero say in what they did and depending on whom your master was you might get treated kindly (not very often) or very harshly (beaten for looking at them).
Workers today have very little say in what they do, and often times are hired for one thing only to be forced to do something else or lose their jobs.