You open the door, seeing an ordinary-looking kitchen with no one in it, and a closed door opposite a stove. You walk inside, and the door closes and locks on its own.

The kitchen is unnaturally bright, with a large pot boiling on a stove behind you, a few knives on a bloodied cutting board, and an assortment of closed cupboards. You try opening a small dumbwaiter hatch with no luck, and turn around to face the new door.

You can:
see what's in the pot,
examine the knives and take one or all of them, even though you already have a penknife,
look in the cupboards,
try operating the stove.

You could also ignore what's in this room and open the door opposite the stove.