Securing your bike is always a challenge and a good bike lock is an important part. One of the challenges with key-based locks is of course someone just picking the lock. An inventor here claims to have created an un-pickable lock since the key chamber is simply not exposed. Just opening the lock is fairly complicated and we suggest just watching the video.
As difficult as this looks, there appears to be some folks at Keypicking.com that think they can still get in.