Door won't open when button is clicked?

I'm making a door that teleports up/down when a button is clicked and making it group rank specific. The error in the output I'm getting is Workspace.Module1.Model.ButtonOpen.Module1Open:8: attempt to index nil with 'GetRankInGroup'

can someone help me figure out what I'm doing wrong?

local Players = game:GetService("Players")                                            
local part = script.Parent                                                                                                                  
local Workspace = game:GetService("Workspace") 
local Door1 = Workspace:WaitForChild("Door1")                                    
local Click = Workspace.Module1.Model.ButtonClose.ClickDetector                                                 

Workspace.Module1.Model.ButtonOpen.ClickDetector.MouseClick:Connect(function(click) 
if Players:FindFirstChild(click.Parent):GetRankInGroup(5339051) > 7 then                           
  
	Door1:MoveTo(Vector3.new(-38.59, 1, -17.925))

The MouseClick event returns the player that clicked it, so click.Parent would be the players service, and you're then trying to find the players service inside the players service which it wouldn't be able to find and would return nil (hence the error).

Since it already returns the player that clicked it as shown here, you can just do:

local Open = workspace.Module1.Model.ButtonOpen.ClickDetector

Open.MouseClick:Connect(function(PlayerWhoClicked)
	if PlayerWhoClicked:GetRankInGroup(5339051) > 7 then
		Door1:MoveTo(Vector3.new(-38.59, 1, -17.925))
	end
end)