Man traps and booths:
A man-trap or booth is most often seen at a bank to enter and exit but it does serve a greater purpose than just banks. The concept is simple, only one door can be open at a time.
The main advantage to a booth is that it limits the number of persons entering an area to only one at a time, forcing them to “clock” in / out. It is more appealing to the eye than a turnstile and can also aid with inclement weather such as hot / cold winds from entering a building - which could in turn have a cost saving in regulating temperatures and keep all your papers from flying about.
If installed in a bank or other high risk area, they could be set to “shut down” in an emergency either trapping the perpetrator or preventing him from entering. They are also much narrower (approximately 800mm wide) so are often used in an area where a turnstile simply wont fit as the minimum opening required is around 1200 mm.