Aranock Online

I feel silly for asking this, but here goes anyways. I am stuck on this quest and I dont know what I am doing wrong. I cannot enter the locked door in the cellar but I have killed all the thieves in the house.

Looking for some help as to what I may be doing wrong. It has definitely been TOO long since I last played

You need to learn lockpicking and buy a lockpick(shopkeeper directly north of temple) for some doors