check in [phrasal verb] 1 : to report to someone when you arrive at a place (such as an airport or convention) to let them know you are there
Passengers must check in one hour before the flight leaves.
Where do I have to check in?
especially : to arrive at and be given a room in a hotel, motel, etc.
check in [=register] at a hotel
Guests cannot check in before 4:00 PM.
Some modern buildings or some security rooms are often equipped with some security systems. You need a magnetic card to get in, see this picture.
So, how do we express when someone is wiping his magnetic card on the security system to get in?
do we say "he is checking in to the building"?
The phrase "check in" in the dictionary doesn't seem to express the action of wiping the card to get into a building / room, etc.