How do I make this script only work if it is spoken by specific teams?

I would like this command to only work if it is spoken by a specific team member. Any help is much appreciated

Script--

local message = "[opencombatdoor]"
local door = script.Parent
function onChatted(msg, recipient, speaker)
	local source = string.lower(speaker.Name)
	msg = string.lower(msg)
	if (msg == message) then
		door.CanCollide = false
		for i = 1, 9 do
			door.Transparency = door.Transparency + 0.1
			wait()
		end
		wait(10)
		for i = 1, 9 do
			door.Transparency = door.Transparency - 0.1
			wait()
		end
		door.CanCollide = true
	end
end

function onPlayerEntered(newPlayer)
	newPlayer.Chatted:connect(function(msg, recipient) onChatted(msg, recipient, newPlayer) end)
end

game.Players.PlayerAdded:connect(onPlayerEntered)