Horror movie i cant remember

I am desperate to find this horror movie i saw just a couple years ago, i think is from between 2015 and 2020.
The only scene i remember is the beginning. People are locked in some types of containers locked by a door with a code. They are outside, i think a forest but i dont remember lots of trees tho, maybe it was just on a land, There are a couple of them and theres one person per container and they try to talk to each other from the window type hole with bars on the door so they can see and hear each other. They try to find a way to find the codes to the lock. I remember a girl (i think) getting her arm through the bars trying to enter a code.
That all i can remember, im sorry for my english its not my language ! Anyone can help me?

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