A method comprising: 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: maintaining the passage barrier mechanism in a multiple entry state in which multiple users at a time authenticate via the biometric imaging system and enter through the passage barrier mechanism; responsive to detecting, via the biometric imaging system, an unauthorized user in the first area of interest: transitioning 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 through the passage barrier mechanism; changing a biometric authentication range of the biometric imaging system from the first area of interest to a second area of interest smaller than the first area of interest; and after transitioning the passage barrier mechanism from the multiple entry state to the single entry state, responsive to detecting, via the biometric imaging system, the unauthorized user in a third area of interest of the biometric imaging system, the third area of interest smaller than the second area of interest and closer to the passage barrier mechanism than the second area of interest, temporarily transitioning the passage barrier mechanism from the single entry state to one or more of a closed state and a locked state in which no users enter the passage barrier mechanism. 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: maintaining the passage barrier mechanism in a multiple entry state in which multiple users at a time authenticate via the biometric imaging system and enter through the passage barrier mechanism; responsive to detecting, via the biometric imaging system, an unauthorized user in the first area of interest: transitioning 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 through the passage barrier mechanism; changing a biometric authentication range of the biometric imaging system from the first area of interest to a second area of interest smaller than the first area of interest; and after transitioning the passage barrier mechanism from the multiple entry state to the single entry state, responsive to detecting, via the biometric imaging system, the unauthorized user in a third area of interest of the biometric imaging system, the third area of interest smaller than the second area of interest and closer to the passage barrier mechanism than the second area of interest, temporarily transitioning the passage barrier mechanism from the single entry state to one or more of a closed state and a locked state in which no users enter the passage barrier mechanism. transitioning 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 through the passage barrier mechanism; changing a biometric authentication range of the biometric imaging system from the first area of interest to a second area of interest smaller than the first area of interest; and after transitioning the passage barrier mechanism from the multiple entry state to the single entry state, responsive to detecting, via the biometric imaging system, the unauthorized user in a third area of interest of the biometric imaging system, the third area of interest smaller than the second area of interest and closer to the passage barrier mechanism than the second area of interest, temporarily transitioning the passage barrier mechanism from the single entry state to one or more of a closed state and a locked state in which no users enter the passage barrier mechanism.