Evac...
The B757-200 variant is certified for maximum PAX capacity of 239. As part of that certification, they need to be able to evacuate the entire aircraft in 90 seconds, with 50% (i.e. 4) of the doors/slides inop. I don't think there would be a problem.
...unless all the PAX insist on opening the lockers and taking their baggage with them which seems the norm these days.