0 to prevent someone from entering a building or room by locking the door:
He had to break into the house because his girlfriend had locked him out.
Management has threatened to lock out the workforce if they do not accept the proposed changes in working methods.
When someone is fired they are immediately locked out of the network.
If you enter the wrong password too many times, the phone locks you out.
Some parts of the system are locked out so they can't be accessed by mistake.
