A device, system and method for controlling a passage barrier mechanism is provided. While failing to detect, via a biometric imaging system in communication with a passage barrier mechanism, unauthorized users in a first area of interest of the biometric imaging system, a device: maintains the passage barrier mechanism in a multiple entry state in which multiple users at a time authenticate, via the biometric imaging system, and enter therethrough. Responsive to detecting, via the biometric imaging system, an unauthorized user in the first area of interest, the device: transitions the passage barrier mechanism from the multiple entry state to a single entry state in which only a single user at a time authenticates, via the biometric imaging system, and enters therethrough; and changes a biometric authentication range of the biometric imaging system from the first area of interest to a smaller second area of interest.