The moment the chain lock is removed, the door swings open without issue. The lights flicker. The sound of chains moving echo in the room again, and you can feel the weight on your throat get heavier, the pressure tightening. Reaching up to your neck still reveals nothing is physically there.

You exit the room. Whether you intend to just now or not, there's not really an option. There's a harsh pull against your neck, the invisible collar attached to an invisible leash. The sound of chains is so deafening as you're dragged forward--you made this choice to continue, you chose to go further and deeper, you chose to lose those precious seconds to get air and start to choke. You're running out of time. At this rate....

The lights go off again. You can't see anything. But you know you're now in another room.