Time of the Wolf (2003) on Netflix

In an undefined time, the environment has been totally destroyed and now the water is contaminated and the animals have been burned. Georges Laurent travels with her wife Anne Laurent, their teenage daughter Eva and their son Ben from the city to their cabin in the countryside. On the arrival, they find that intruders have broken in the house, and one stranger kills George. Anne, Eva and Ben wander through the village asking for shelter and supplies for their acquaintances, but they refuse to help them. They reach an abandoned barn and spend the night inside. On the next morning, they meet a teenage boy and they walk together to a train station, where they find other survivors. Together, they wait for the train expecting to go to a better place in the middle of the chaos.