Some of the characters have methods to get them out of the oifice right? Im wondering if there's a way to stop her or not

The only way to prevent Nougat from getting in is to close the door before her pillars have any chance of crossing the barrier.

Once she is inside the office, there is no getting her out.

I guess you could technically go to either hallway or the monitor to delay it, but yeah, it doesn't look like its possible