"Open, Sesamy!"?

There is a locked door in the Dozo ruins. It requires a key to open. Where or how do I find this key?

The door you're referring too can be unlocked with the open lock skill or a key. The key is obtained by following the questlines starting from Dozo. First you defeat Bane, then you defeat the ghost in the shadow tombs who drops the key for that door.

Behind the door is a treasure trove of random and statically dropped goodies.

Thank You for reply!

I checked the log while using the open lock skill. The log says that a "...specific key is required...". Not sure how to start the questline, the NPCs in Dozo doesn't seem to have anything to say. As for Bane, he doesn't spawn at his hideout. Perhaps all this is glitching at the moment?
I got into tomb of Shal'Ka, though, and got a journal entry. Open lock work there.

It shouldn't be, but I'll do a check to be sure.