Wage slavery is similar owning and renting a person.
I have heard some talks about this recently. Im not all that familiar with the subject though.
 It is usually used to refer to a situation where a person's livelihood depends on wages or a salary
Is it hard for someone to leave that situation?
I would say yes because in sweatshops), and as a lack of workers' self-management, fulfilling job choices, and leisure in an economy. Its hard to do anything else.