Sounds good!
Instead of 'lockpicking gives bonus items', which may indeed sound unfair, most games use the more aptly 'smashing open a container may give less loot (some may break)'.
Which essentialy is the same, but sounds less like lockpicking just creates items out of thin air smashing does not (there's already luck for that ;))
That would also be a good alternative. I do note though, that items are generated upon mouse over, before opening. I've even seen "Lucky Find" appear over a chest which was still locked.
