Actually.. 63-70 is the big WR mystery... Im stuck at 63 skill. EVERY person over 63 used skill points to get to 70. I don't have that luxury.
Warrens/Thurg/Erudin Basement - Too Easy
Fungus Grove/Unrest/Erudin Bank/Eldenals/Mielech - Too Difficult
There is only one more door to my knowledge that I need to try, and that is in First Ruins. If that door is too difficult, chances are I will just forget about Pick Lock and give up. I'm not about to run around Shadowhaven for hours checking all the 30? or so doors.
I'd recommend getting 2 levels, and putting 7 points into it. As of now, it's the only known way.