The corporate security theater that kills me is insisting that everyone tap their badge on the reader next to an already-open door. Even in the presence of a guard, this merely ensures that everyone passing through the open door has some object, plausibly badge-shaped, to hold near the reader. Essentially any NFC card will make it beep. Only a valid credential will actuate the lock, but the door is already open, and the click is too subtle for its absence to alarm anyone.

There is a device you can deploy if you're serious about ensuring that every single individual in a moving crowd has a valid credential... a turnstile! Assuming you've calculated the appropriate number of them for the expected traffic flow.