I doubt these card readers would prevent someone leaving the part of their building they’re in, as that’s a lesson written in charred corpses and was a foundational aspect of health and safety becoming a thing: https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fi...

In theory it might prevent access to other buildings, but equally often the card readers are around doors of mostly standard glass or near internal windows of the same.

So if that’s the motivation, it doesn’t seem like a particularly effective mitigation