Help with For Loop?

Okay so this is the code:

if key_code == 13 then

        local slot = l1:Clone()
		slot.Parent = l1.Parent
		slot.Name = "Slot"
		slot.Position = UDim2.new(0,0,0,55*num)
		slot.Text = player.Name
		slot.Visible = true

Basically I just want a for loop to run every time key code is 13. I need a for loop because I need the slot position to move down every time it runs. I think you would use a for loop in this situation. If there is an easier to just move down the slot position every time key code is 13, then please help me out. Thanks!

You would use a while loop.

while true do
	wait(.1)
	if key_code == 13 then
		local slot = l1:Clone()
		slot.Parent = l1.Parent
		slot.Name = "Slot"
		slot.Position = UDim2.new(0,0,0,55*num)
		slot.Text = player.Name
		slot.Visible = true
	end
end