Hey Modactor! How are you?
If the third ending is the True Ending, you must return home, close the front door, and lock it. After that, the Soul will walk around the house. He will appear at the back window watching you and surveying the interior, then he will break the window to get inside. Right after that the player must unlock the front door and run because the killer will be inside the house.
If it is not the True Ending, the other two endings are achieved by taking the car key. In the new update you have to go into the trailer to get the key, then escape with the car from the shed.
The remaining ending is attempted by trying to flee down the street.