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IANAL, but I do not believe so. The school carry laws prohibit carry in a parking lot, but amusement park carry laws specifically say: "The term does not include any public or private driveway, street, sidewalk or walkway, parking lot, parking garage, or other parking area." So the law is sort of divided.

Not only that, employee parking lot carry laws prohibit a business from restricting the carry and storage of firearms by their employees in the parking lot.The sign you posted would attempt to do exactly that, meaning that this sign is not only non-compliant, it is illegal as the language makes no exception for employees. If any employee decided to report the sign, it would have to come down.