if u are familiar with PAS bagball house, theres a tmap house next door (NW). In that house, level one, is a table dedicated to working lockpicking. Theres a rune to the THB lp house, but theres also runes to a series of locked chests in the Yew crypts, in Vesper bank, and some other places. Those will give skill gains when u hit the cap on man made chests to LP.
They also respawn fairly quick. if u go to a spot, u can see one disappear every 5 min or so, and another take its place. Its still slow gains, but u can recall to an area, lp the chests, recall to the next, and some new ones will be back at the original recall spot to keep trying.
I was so

ed with gains that I finally just took my .1 gain each night for the last 30 gains. Took a month, but I finally made gm lp.
If you need a rune to bagball, ask any PAS, as most of us have a rune there.
KD