Hi @pezzott1,
thank you very much for help. I tried to do everything as you described and I understood the overall idea. However, I still have a problem, because it still isn’t working at all.
I wanted trigger to be small, round and without any glowing parts, so instead making it as a box, I made it small, round and black. Then I made the Toggle State function, but since I don’t need the trigger to glow, I didn’t create the Set Glow Color function. After that, I entered the Event Graph tab and created that Event AnyDamage thing.
As for the door I created the Array in the way you told me to and then I created also the Bind Lock Triggered function. Atfter that, in the Create Event field I selected “Create Matching Function” and it created a function that I renamed to “Locks Check”. At the end, in Event Graph I made everything like you showed on your screenshoot.
When all things mentioned above were done, I placed the door and the trigger on the wall next to it. I also renamed that trigger to “StartDoorTrigger”. After that, I left clicked on door and added 1 element to the array. When the “Index [0]” thing appeared I changed its value to the “StartDoorTrigger”. It looks like that:
That’s all I did and for me it looks almost exactly like how you described and showed on your screenshots (the only difference is the lack of Set Glow Color function and the names for Door and Trigger actors), but for some reason when I did it, it’s not working.
I was trying to upload here more screenshoots, but since I’m a new user here, I can’t upload more than only 1.
I was trying to find the problem for the entire day and still got almost nothing… 
Do you have any ideas what could I made wrong or what should I check?