If you walk through a door that wasn't meant for you, God will close that door (the opportunity falls through). God opens doors, but some believers (myself included) should seek God as to what door(s) he wants them to walk through. When God opens a door and you have peace about that door, that's the door you're supposed to walk through.
When the Holy Spirit closes doors, it is because those are not the doors you are meant to take.— Florida Made (@RichardMIATL) February 19, 2020