To answer your question...

It doesn't.
Most local employers still follow their old ways.
That's why Qatar's being criticized internationally
after they won in their bid to host the FIFA 2022.
International community said that expats are treated
as slaves like in the olden days. So they own you,
you cannot transfer to another employer, you cannot
leave the country unless they permit you to.

So if that is your case, your in their mercy.

I'm sorry if I offend locals & some employers
with this post, but although it is the law and
customs around here, it doesn't make it right.

In religion for example, one should face all
necessary temptations to test the strength of
his faith.

In business, if an employer CANNOT take good
care of his employees and they want out, be
man & respectful enough and let them go free.
Because somebody else CAN.