Here's a hypothetical carry situation that came to mind today:
Your car is acting up so you make an appointment with a mechanic or the dealer to take the vehicle in for repairs. When you arrive at the service entrance, you notice a Criminals Welcome (no weapons) sign on the door. You're carrying. You can't enter the building while carrying. You can't store your firearm in the vehicle because firearms aren't permitted on the premises.
What do you do?