The door handles are similar in design to the E46 and pull out and upward for opening. Removal of the handles is also similar to the E46.
There are no serviceable components on the lock/latch. The assembly must be replaced as a unit.
The lock cylinder is removed by removing the torx screw through the access hole in the door. Once the screw is removed, the lock cylinder can be pushed out of the handle assembly.
The handle is removed by loosening the hex nut holding the handle to the latch mechanism.
The handle is then removed by pulling it out and down to release it from the latch. The handle is turned down to the left to release it from the door latch assembly.