i cant open my door with my key it want even turn. what is the problem on 2001 Land Rover Discovery

i went in the house for about 20min. and came out side to get in my car and i could not open the door

Asked by for the 2001 Land Rover Discovery
lock cylinder locked up or the latch has failed. get a shop to check and confirm.

1 more answer
Possibly a tumbler wafer in the lock itself has broken