The screen focus should have moved with the imp, to show him unlocking the hatch that was behind the counter in the south of that room. The skeleton doll is relatively weak, and I only used it as a mule (to carry stuff). If you are close to the start of act 2, you could re-load your last save in act 1 and go get it, then re-do the beginning of act 2. If you have done much, though, I wouldn't bother; just wait until you get the next one.
