local meta = FindMetaTable("Entity")

if !isfunction(meta.isDoor) then

	function meta:isDoor()
		if not IsValid(self) then return false end
		local class = self:GetClass()

		if class == "func_door" or
			class == "func_door_rotating" or
			class == "prop_door_rotating" or
			class == "func_movelinear" or
			class == "prop_dynamic" then
			return true
		end
		return false
	end

end

hook.Add( "PlayerUse", "NoDoorSpam", function( ply, ent )

	if ent:IsDoor() then

		if !ent.LastDoorUse or CurTime() - ent.LastDoorUse > 1 then

			ent.LastDoorUse = CurTime()

		else

			return false

		end

	end

end )