How do you make a gui's adornee go on a part that is closest to you and at least 10 studs away?

I'm trying to make a gui's adornee on a part that is spawned by someone when they click a button. Also, the person who spawned the part is the only one who can see the gui on that part. The gui will only pop up if the part is the closest to the player that spawned it and is ten studs away.

I tried doing this:

local plrName = script.Parent.Name
local rK = game.Players:GetPlayerFromCharacter(script.Parent).PlayerGui:WaitForChild("RKeyGen")

while true do
	for i, v in pairs(game.Workspace.Bricks:GetChildren())do
		if v.Name == plrName then
			local pPos = v.Position
			local lPos = script.Parent:FindFirstChild("HumanoidRootPart").Position
			local pAvg = (pPos.X + pPos.Y + pPos.Z)/3
			local lAvg = (lPos.X + lPos.Y + lPos.Z)/3
			local sAway = math.abs(pAvg - lAvg)
			v.NumVal.Value = sAway
		end
	end
	n = 0
	for i, v in pairs(game.Workspace.Bricks:GetChildren())do
		if v.Name == plrName then
			if n ~= 0 then
				if v.NumVal.Value > n and v.NumVal.Value < 10 then
					rK.Enabled = true
					rK.Adornee = v
					n = v.NumVal.Value
				end
			else
				n = v.NumVal.Value
			end
		end
	end
	wait(0.25)
end

But, the gui just pops up even when theres other parts closest to me and it stays on the same part even when i am like, 30 studs away from it.

Any help?