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You're better off with a Kahr or a Walther PPS for concealed carry like that. It can fit in your front pocket and be concealed by pocket/apron. You can get a Walther PPS in .40S&W if you're concerned about caliber. Make sure you have a pocket holster though -- don't want that thing falling out when you have to make a trip to the restroom!

But as Oldgringo has already said, carrying in your workplace when it's a policy violation is never advised, although I'm the type that feels you should weight that against your own safety concerns. Hopefully your restaurant doesn't have a 30.06 sign.