Your key should insert all the way and turn 180 degrees smoothly. If it only turns 90 degrees or you can't insert the key all the way, take a look at the cylinder to make sure that all the discs are aligned. You can align the discs with a small flathead screwdriver or anything thin enough to fit in.You can also use your key by turning it back and forth to align the discs. Once you push the disc back into place, your key should insert fully and turn 180 degrees.
You can also try using lubrication, such as Finish Line, in the keyway to flush out any dirt or debris.
If these do not work, submit a ticket with a picture of the lock and keys.