Life Safety Code

I work in a bar in a station, I doors leading into a patio. There are handles on the doors that lock so people can leave but not get back in. Is this legal? Security guards say that we should leave the doors unlocked, but the other doors in the station are locked from the outside, but bumpers inside to unlock them. Can I lock the doors at the handle so that people can leave but not get in. The station is located in Wisconsin.

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