I was given 2 Motobecane Model 7's, niether of them came with keys.
I was able to pick the lock with picks I borrowed from a friend.
This is a very tightly made lock so it is a little difficult to pick. Lube it first with WD40 or similar and remove the retaining clip. The lock turns counter clockwise to lock the forks. Once turned, ir will lift right out.
If you want to make a key, a Cole VR6 blank worked in mine.