How can i check if a player is in a specific area and holds a button?

So basically i want to check if a player is in a specific place (i used onTouch) , and i want to see if the player holds a button in that area, but nothing happens with my code:

local sensor = script.Parent
local function onTouch(sensor)
    KeyHeld = false
function onKeyPress(inputObject,gameProcessed)
	if inputObject.KeyCode == Enum.KeyCode.V then
		KeyHeld = true
		while KeyHeld do
		-- code
		wait()
		end
	end
end

function onKeyRelease(inputObject,game.Processed)
	if inputObject.KeyCode == Enum.KeyCode.V then
		KeyHeld = false
	end
game:GetService("UserInputService").InputBegan:connect(onKeyPress)
game:GetService("UserInputService").InputEnded:connect(onKeyRelease)
end