How to repair a French Door latch that's keeping the door from opening
I had a similar problem with a Sierra Pacific door. On mine you raise the handle (clockwise) to lock and lower the handle (counter clockwise) to unlock.
I lowered the handle as far as it would go and then with a small screw driver pry the pins up / down to fully retract the locking mechanism. That would be your pin in picture #2 and the one that goes into the floor.
I was not able to find a replacement that would fit, but was able to fix the broken piece.