Not legal advice - but I would suggest you only use something like pepper spray only in defense of yourself from physical harm, not to keep someone from escaping. I would highly recommend not using it at all, and as others have suggested not inside - especially with the coronavirus possibly damaging another patron's lungs already. Also, FoxtArt is correct, Colorado law only authorizes a citizen's arrest if you personally witness the suspect committing a misdemeanor or felony. Call LE, and let them handle it if they try to escape. That would be my non-legal advice.

Also, if you do decide to carry pepper spray on the job, I would strongly suggest you be exposed to it in a training session - and keep documentation of that training.