I got to the place where u need to lockpick the door with help from your vampire powers. I sneek killed the guy and am told to go ahead, but I cant unlock the door. When I try, it says your lockpick skills are below 3. What am I doing wrong? I use mouse2, then lockpick but it will not open the door. Help!

try bloodbuffing, that usually works in those cases. If it still isn't high enough, bloodbuff again and that should raise it one more time.