And presumably when she gets off it the door closes again.

Hey lumpy, get over here. Is it heavy enough to keep the button down?

Appears to be!

Then she leaves it there and goes through the door.

"If cube—and button-based testing caused this emergency, don't worry; the odds of this happening twice are very slim." The door doesn't open all the way, though—half of it opens but the other half remains stuck and emits sparks. And farther ahead there is a blue forcefield on the way. "Please note the incandescent particle field across the exit. This Aperture Science Material Emancipation Grid will vaporize any unauthorized equipment that passes through it."

"And what the hell counts as unauthorized equipment?"

The recording does not answer this question.

Oh fucking hell. Are there any ways around it? Crumbling walls able to be knocked down or clambered over, that sort of thing?

No, the place is derelict but in a "nature is reclaiming this" sort of way not in a "this will turn to dust soon" sort of way.

Not even using the stool as a battering ram?

Nope.

Well. Shit.

She throws the stool through the forcefield.

It makes a strange buzzing noise, becomes black, and dissolves into a cloud of disappearing sparkles.

Fffuck.

The environment is unresponsive.

...She sticks a finger through.

Nothing happens to it.

Shit. Shit shitshitshitfuckit.

She runs through at top speed.

Absolutely nothing whatsoever happens to her. There is a lift waiting for her on the other side.

Ugh. Into the lift.

The walls around the lift are wrecked enough that there are actually some holes she could squeeze through if she wants to...

Not actually interested in climbing.

Then the lift will sink into the floor.

Booorrrring.

The voice pipes up again as the elevator descends: "If you feel liquid running down your neck, relax, lie on your back, and apply immediate pressure to your temples." The elevator stops in a chamber very similar to the one it left from, except the walls are less destroyed.

Oh that's very helpful. On both counts. Why is she in this place again? Oh right, the idiot eye. She really is going to have to kill it the next time she sees it.