Locking rooms would be a tough cookie for him to wiggle out of, how about the disconnecting life support thing? He'll explain that he'd be trying to move the patient but wouldn't know that no, you're not supposed to do that without having some sort of super speed or power?

She and Huntress can come across a person or two locked in their rooms after they meet Jack, it's up to them if they chalk it up to him being dumb or him being sociopathic.