People are still human beings even while at work. There is a limit to how much an employer owns a person, even when they are an employee, even when they are in the building, even when they are on the clock.
Employers try to push that as far as they can get away with, so there are current examples of employees being treated worse than cattle that should be illegal and probably is, but that is just employers overreaching and getting away with it because of the usual power discrepency.
And my point with all that is the rest of us have no right to anything the employer has no right to.