Locked door

I'm trying to make some linear structures for my mod. I have some locked doors that I want to unlock with a keycard. I've tried replacing the locked door with an unlocked version when I use the keycard on it but that just makes the bottom half of the unlocked version appear where i right click and the top half dissapear entirely. I'm open to learning to code if that helps, and I've done some javascript in the past, but I've forgotten most of it.