Usually , they use plastic wedges ( hammered in ) to open up a small gap and access the inner door handles etc , but it is still hit and miss .I understand now. I thought the guy could go in over the top of the door frame (weakest point).
Unless OP needed the car for work, I’d still have gone with my suggestion of ordering a key from the dealer ; he is already £65 into the cost of a new key , and if the locksmith does any damage at all ...