Frame lock that can lock without key inserted Does a frame/wheel lock that can be locked without the key being inserted exist? And if so, how secure is the lock itself (I heard that this style of locks that can be locked without the key inside are more susceptible to picking than normal style locks)?



These locks are variously named ring locks, cafe locks, O locks and defenders.

Update: There is another style of lock that is similar to the one picture above, but it has a straight locking bar instead of curved one. This type can be locked without the key inside, but it's not as easy to close and open due to the bar not being curved.
You should note that non-key-retaining locks that don't involve a separate lock-actuating lever are susceptible to shimming.

Before buying a lock, you should always google or YouTube search to see if your lock can be easily shimmed or bypassed. 

Ps I would not worry too much about picking unless it's a tubular lock, as most thieves will prefer to use physical force (cutters, grinder) as they are much faster (5-30 seconds) than picking (1-5 minutes in ideal circumstances; 3-20 in non-ideal).