With my housemate's Kryptonite lock, I was able to stick a bic pen right in and twist, but my own Kryptonite lock from 1998 key number NBA 5XXX (not sure of brand because use has worn off letters, but it has special narrow long shackle, costs about $45) has a wider diameter than the bic pen/new Kryptonite - and this is also true with 3 generic $10 ulocks that I have. I would have to search out a wider pen. Can anyone earlier who was talking about opening a lock with NBA key describe what they did?

Earlier, people were talking about stretching out the bottom of their pen barrel, but I applied a lot of force and twisted clockwise etc and it did expand to fit around the wider cylinder, but I still couldn't get anything to move.