I was looking to build a RFID operated turnstile similar to picture below. I will have RFID readers on both ends where the door would open from either end only if the RFID is authenticated on either end. I was wondering what are the type of locks used in these turnstiles which open the turnstiles when an RFID authenticated and then lock these turnstiles and prevent them from moving after a person enters through the turnstile after successful authentication. Are these special locks or some kind of electromagnetic locks ?
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