My admin script is not working?(specific title)

I'm making my own admin script and I'm not so successful.

function bancheck(plr, ban)
	if ban.Value == true then
		plr:Kick("You're banned")
	end
end


function Admincheck(plr, Admin)
	for i, Name in ipairs(Admin) do
		if Name == plr then
			admin = true
		end
	end	
end

function onkill(msg, plr)
	if msg:sub(1, 6) == prefix.."kill " then
		local TargetPlayer = game.Players:FindFirstChild(msg:sub(7))
		if TargetPlayer then
			local ctr = TargetPlayer.Character or TargetPlayer.CharacterAdded:Wait()
			local hum = ctr:WaitForChild("Humanoid")
			hum.Health = 0
		elseif msg:sub(7):lower() == "me" then
			plr.Character.Humanoid.Health = 0				
		end
	end
end
	
	
function onban(msg, plr, Admin, vip)
	if msg:lower():sub(1, 5) == prefix.."ban " then
		local TargetPlayer = game.Players:FindFirstChild(msg:sub(6))	
		if TargetPlayer then				
			for a, b in ipairs(Admin) do			
				if b == TargetPlayer.Name then
					if plr.Name == vip then							
						if TargetPlayer == vip then							
						else
							Banned:SetAsync(TargetPlayer.UserId, true)
							TargetPlayer:Kick("You're banned")
						end
					end
				end
			end
		end
	end
end

function shutdown(msg)
	if msg:lower():sub(1, 10) == prefix.."shutdown " then
		game.Players:ClearAllChildren()
		workspace:ClearAllChildren()
	end
end
										
DS = game:GetService("DataStoreService")
Banned = DS:GetDataStore("BanList")
Admins = {"HappyTimIsHim", "vinatul", "crundee341_AltV2"}
plus = {"HappyTimIsHim"}
prefix = "!"
admin = nil

game.Players.PlayerAdded:Connect(function(plr, ban)

	ban = Instance.new("BoolValue")
	ban.Parent = plr
	ban.Value = Banned:GetAsync(plr.UserId) or false
	
	bancheck(plr)
	
	Admincheck(plr, Admins)
	
	if admin ~= nil then 
		if admin == false then return end
		plr.Chatted:Connect(function(msg)
			onkill(msg, plr)
				
			onban(msg, plr, Admins, plus)
			
			shutdown(msg)
		end)
	end
end)

why is my script not working? I'm not good with indentations. So deal with it