Either the government does it or you join a union. I am a member of a large construction trade union and it’s written into our contract that we cannot be denied time off and can’t be forced to be available during off hours or made to work overtime.

The catch is that if you want to advance in the company it really helps if you can make a little extra effort. You absolutely will never be penalized for sticking to the minimum requirements, but you also will never move up into management, which is perfectly fine with a lot of people.