Where is the key to the 3d locker room of the subway simulator?

It's in the hands of an NPC in bridge opening behind the charity. According to the relevant information of the game "Metro Simulator 3d", in the game, the key to the locker room is in the hands of an NPC in the bridge opening behind the charity, and the player can obtain it by completing the NPC's task. Metro Simulator 3D is an application of IOS platform.