[claytongulick]

Working for an employer is selling your time and effort to them.

During the time that the employer is purchasing from you, your duty is to your employer, fulfilling their legal requests.

If you don't fulfill this duty, they will no longer have a desire to buy your time.

It's really not any more complicated than that.

[Kinrany]

Fortunately the reverse also works*: if the employer doesn't follow the rules the employees agreed on, they will no longer want to sell their time.

*but less often because it's harder for employees to coordinate