It's good to keep your house safe.
May, who has a large and luxurious house, is in a rush and needs to run off to work very quickly.
May wants to exit the house and leave.
May quickly locks the door on her way out and leaves for work.
May runs out of the door without locking it and drives off to work.
A thief comes to the house and can't get inside.
A thief comes up to the house, enters it, and plunders it for all it's worth.