Do Aikido and Hapkido Locks Work?

I see a lot of demos from aikido and hapkido experts where grown men grab their wrists and get thrown/taken down. Wrist locks do work a after you stun an opponent and they are better applied when you have someone down. Having learned hapkido locks before studying judo, I will tell you that they don't work like most instructors teach 'em. If you have ever been grabbed by a decent judo player, you will know that you won't be twisting his hand off into a lock. If you have somebody throw a half way decent punch at you (like a boxer), you won't be sidestepping and grabbing his wrist. Before doing any of the above it is best to stun the opponent with a strike or throw.