Which, depending on case law in a particular jurisdiction, may or may not actually be enforceable. This is exactly why you would want to talk to a lawyer: they can tell you if you have a leg to stand on.

The employer might be under the impression that all the terms in the employment contract they pulled off FreeLegalTemplates.net are enforceable when they aren't. Going to a lawyer first gives you the ammunition to politely point out that you are in fact the one in the right here.