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