When Jamie enters the corporate office of his firm, he must pass through a small area with two closed doors. After entering through the first door, it will lock behind Jamie, and he will need to show identification to access via the second door. What is this called?

A mantrap is a type of trap intended to prevent infiltration methods like tailgating and piggybacking. A mantrap is a small enclosed space with two lockable doors that separates the outside world from a safe location. A person will enter via the first door, but that door must be closed behind them before the second door may be opened.