Sheldon Brown recommended two locks of different kinds so the thief would need two different tools. (That advice came from the era when battery-powered angle grinders were not as ubiquitous as today.)
Two locks? Are you crazy?
Hey, I can't assess your security environment. A fellow with a cycling organization in London said in two decades he'd never heard of anyone using the two-lock method getting their bike stolen.
Anyway, if anyone is actually concerned about lock-picking bike theft, use two locks requiring two different picking tools and techniques.
Depends. Way back my bike was stolen with two locks on it. See this thread:
https://www.bikeforums.net/fifty-plu...olen-bike.html
Short story the bike was secured to a light pole with a cable lock. The ulock wouldn't fit around the pole, it locked the rear wheel to the frame. The thief cut the cable and carried the bike off.