Simple solution to the problem of carrying a gun into a place that does NOT allow guns, go somewhere else and spend your money. My gun is part of me and if you don’t allow my gun, you don’t allow me. End of story!
Most people are not going get that deeply involved in such a lawsuit or public complaint. Jack in the Box can always say their primary purpose is to provide fast food, not safe refuge from criminals outside of their actual restaurant. The employees would have a better chance of being taken seriously
using that argument, because they are confined to the premises for a set amount of hours. Heaven help the restaurants if their workers start heavy unionizing, because then, the employers would be subject to all manner of demands, on top of OSHA safety laws.