Honestly, not at all. I recommend to instead set two obsidian blocks where the door is now and write a note on it similar to notes you would find in slenderman "Don't look back" or something... it would scare many more people away. This here just makes me more curious and I want to break in at all costs.
I had a sign like this once in the end at my enderman farm before grief protection was a thing, someone broke my door and my sign and replaced it with a sign calling me selfish lol