2 Goats Million Dollars Door Riddle

You are on a gameshow. The gameshow host tells you there are three doors. Behind two of the doors are a goat and behind one of the doors is a million dollars. He tells you he will reveal a different door after you make you selection. You pick one door and he then opens a different door to reveal a goat. He then offers you the option to switch doors. Should you change the door you picked? Keep it. Or does it not matter?