This looks ideal and makes complete sense. At least with having Vector variables I can control the exact amount of units it moves to. 
However, now, the door just… disappears. o_O I’ve temporarily disconnected the reverse nodes whilst trying to get the door to open correctly. Maybe it needs to be converted from Vector to Float? I tried setting the Z axis of Opened Location to 15, but it still disappears.
I’ve also tried mixing your setup with my original, and whilst the door opens correctly, it still doesn’t close. In fact, if I keep walking under the door, it continues to go up. Which doesn’t make sense because wouldn’t the trigger/collision be going up with it…? Or does that stay behind? If it stays behind, that would make sense.
I figured out, from the setup I made based on the course I’m following, why the door kept going up instead of down. It was due to this part:
It was constantly making it go up 15 units every time. 