You can unlock the Closed Casket trophy in Layers of Fear 2 during Act 4 of the game.
Some way into the act, you will come across a gate that you will unlock by using a switch. As you walk through the gate, you will see a coffin that is on fire. As you walk past it, you'll be chased down the stairs in front of you. Head down the stairs and follow the path until you reach another open coffin on the floor. Close the coffin and the trophy will unlock.