My advice would be to carry well concealed pepper spray, keep it absolutely secret, and be prepared to be fired if it is found out.
I openly carried a large knife on the job at any number of places I worked with, and it was never "noticed" despite a no weapons policy, because I was so bloody essential to the success of the company. A gun would have been a completely different thing.
A knife was better than nothing, pepper spray may have been better. If it had existed at the time, I may have had both.
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