Yes. This is the wide-mouth dimple lock where you can use flag and rake. Those see-through training locks you can get from Alibaba are also of that type. You can even use regular rakes on those by rotating them slightly.
Do you have example of a key and keyway that are "extra slim"? I can't quite imagine that it's not possible to adapt some kind of pick - after all the key has to fit, and has to slide int the lock, "pushing" pins out of the way?
I can certainly see how such locks might be more difficult to pick, though.
I have this bicycle lock I recently found. There no room on left side of the pins, meaning the dimples are almost at the edge of the key. And on the right side there is a wall blocking half of the key way. Flag should be really curved to reach over that wall. https://photos.app.goo.gl/PjTEiqy3vRCULy366
