Casting - How to make door open upon projectile collision with object?

Hi, I’m trying to make it so when the player shoots at a sphere and the projectile hits it (first person template), a door will open behind it. I have two blueprints, the sphere, and the door. A lot of sources spoke about casting but I can’t get it to work, I’m a complete newbie to blueprinting.

The sphere blueprint:

Door blueprint:

That branch is not doing anything neither is the first cast if you plug both exec to next node. Delete the branch and only use top exec of the cast for this.

You need a reference of the door: Set and Get an Actor Reference | Unreal Engine Documentation