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What follows is my understanding of the law. If I get it wrong, please correct me.

Under the parking lot bill, you are fine legally to carry to and from work as long as the person leaves the gun in their locked vehicle upon arrival and doesn't fall into one of the exemptions (school district, property leased by oil company, etc). As for the employer, they can fire you for doing so as long as they don't specify that as the reason you were fired.

Once you arrive at work, if company policy says no, and you've been apprised of that policy, you are guilty of criminal trespass. If you have not been apprised of policy, or there is no policy, you are fine legally, as long as you leave after being told and do not repeat the action. Your employer can fire you regardless.

The exception would be if employed at a 30.06 posted business (bar, posted hospital) or always prohibited place (school, federal court) in which case you would always be in violation of 30.06