Glad you figured it out! That code snippet I sent you was wrong anyway, sorry bout that. Not a useless post! It helped me remember how to do it correctly and that there is an even simpler solution available.
For anyone looking for a solution:
https://www.unrealengine.com/marketp…asy-multi-save
The easy multi save system is free at the moment. All you have to do is add the interface to your blueprint holding your door states array and set the variable to save. It has one save node and one load node that handles everything for you.
Documentation explains it well: Easy Multi Save Documentation - Google Docs