I was able to get my lockpicking up to 97 with the practice boxes in the Redridge Mtns. After that I tried uping my skill on practice locks (I'm an Engineer). However, my skill would not go up with these. I did the Kalven's Tower quest in Westfall to get my poison skill and a few days later I went back to the tower with two friends to practice my lockpicking on Klaven's Duskwood Chest. We were able to easily kill him (lvl 21 rogue, 23 pally & 25 hunter) and I could repeatedly pick the lock on the chest until I was up to 110/110. Now I'm wondering how to increase the max on my lockpick. Hope this helps and any advice how to move further is appreciated. :o)