Survival of the fittest

Four friends fresh out of high school luck out ending up in the same university ready to make memories unforgettable decide to celebrate it with a week day deserved trip.

Except mid trip, when Nia gets out of the hotel to the shop nearby early that morning sees that the cashier looks exactly like her.
excusing it as tiredness from all the driving, she doesn't pay much mind to the situation not until her phone tings with alert.
there's an apocalypse break out.
And its like nothing like they have watched in movies about.
ok might be except they have them like doppelgangers almost everywhere they turn their heads to.
And specifically it has been mentioned to not leave your door till given time.
Essentially trapping them in the hotel.
is this the end of the world?
or the end of the world they knew?