About the only thing I've seen that qualifies is the no-car, metal gates to walking/camping trails in State Parks (PA, anyway.) The key-lock is surrounded by a 1/2" steel can, with only the bottom open and some distance to the lock itself. Attempting to pick that would mean being upside down 2 feet off the ground. The steel shroud would thwart a casual angle-grinder for long enough not to bother.

Most other security for locks I've seen could be defeated with 60 seconds and a 3" cutoff tool that fits in a pocket.