This situation reminds me (at least in a tangential sense) of something that happened to me at Best Buy once.

I walked out the wrong door.

At the time of this incident, they intended to route all inbound traffic through one door, and outbound through the other, presumably to go through their loss prevention scanner. I bought nothing, walked out the "wrong" door, and was several feet into the parking lot toward my car when their security guard told me to come back in the door and go through the exit. I politely but emphatically told him I had absolutely no intention of doing so, and left.

I can't help but wonder how one security guard kept them from leaving, particularly if he was unarmed. I'd have scooped up the child and kept right on walking.