Why my RemoteEvent does'nt work?

Your mistake there is touched does not save player, it actually saves body part that touched it

so what you need to do is check whether or not if its player touching it, then get player and then compare whether it's owner or just some random player

--SERVERSCRIPT
script.Parent.Touched:Connect(function(hit) 
	if hit.Parent:FindFirstChild("Humanoid") then
		local player = game.Players[hit.Parent.Name]
		if player.UserId == game.CreatorId then
		game.ReplicatedStorage.TestPassed:FireClient(player)
 		end
	end

 end)

--LOCALSCRIPT
game.ReplicatedStorage.TestPassed.OnClientEvent:Connect(function()
	 workspace["Owner Only Door"].Door.Transparency = 0.5 workspace["Owner Only Door"].Door.CanCollide = false 			 
end)

I am sorry if there are any errors, I have not checked the code