@futurebird @MarkHoltom
I had a friend lose a key for a lock like that one, and we found that squeezing the barrel with some garden sheers popped it open. My bike came with a lock built into the back that has a slot for a chain (close it and it immobilises the back wheel). I really like that design and still have one, but the model it came with has the world’s worst lock: you can open it with a key blank.
And no lock works against the attack that a gang did here 10-15 years ago: they came with a forklift and a low loader and pulled up the metal hoops that you attach the bike to. In five minutes, they were able to take an entire bike park. They presumably cut off the locks later.
This is the main reason I haven’t bought an e-bike. My bike looks old and cheap. My main defence against theft is to always park near a more expensive-looking bike.