There are many different makes and types of lock that fit to up & over garage doors. This one had a euro cylinder in it to lock and unlock the door and a handle to release the two latches on the inside holding the door shut.
This lock had failed and was refusing to lock / unlock with the key. When taken apart there was a broken bit of cast metal which makes it impossible to repair 100% reliably, so a new lock was needed.
It never ceases to amaze me how many different styles, types and sizes there are of essentially the same lock.
This lock manufacturer name was Novoferm.