I'm surprised this hasn't come up before, isn't the US full of e.g. military installations where employees work by the hour and clock in/out, and where there's

I'm surprised this hasn't come up before, isn't the US full of e.g. military installations where employees work by the hour and clock in/out, and where there's some gate check going in & out of the installation that might take a non-trivial amount of time? E.g. the CIA & NSA have such gates, and presumably the same goes for a bunch of military and security contractors.