What, you think I'd lead you to my own house and leave you here alone? [He calls through the door.] It's unlocked, just come in.

[It had to be - Sombra will notice as she comes in that the door is rigged up to something that looks suspiciously like a venom mine, filled with glowing yellow liquid. Unlocking it is the only way to disarm the trap. The other thing she'll notice is that the room is starting to smell like cooked meat.]

Hope the neighbors didn't give you too much trouble. Junkies make the place feel a little more like home.