why can I pick up the wood with any keycode when I just want it to be the keycode F?

I was following a tutorial but I changed some things so it is usable on mobile, so then players can click the wood to to pick it up, it works perfectly exept that it can get picked up with any keycode instead of just the keycode F.

local UIS = game:GetService("UserInputService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local PickupItem = ReplicatedStorage:WaitForChild("Remotes"):WaitForChild("PickupItem")
local pickupKey = "F"

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local item = mouse.Target
local distanceFromItem = nil

local PlayerGui = player:WaitForChild("PlayerGui")
local PickupInfoGui = PlayerGui:WaitForChild("PickupInfoGui")

UIS.InputBegan:Connect(function(input)
	if mouse.Target and input.KeyCode == Enum.KeyCode.F then
		if mouse.Target:FindFirstChild("Pickable") then
			local item = mouse.Target
			PickupInfoGui.Adornee = item
			PickupInfoGui.ObjectName.Text = item.Name
			PickupInfoGui.Enabled = true
		else
			PickupInfoGui.Adornee = nil
			PickupInfoGui.Enabled = false
		end
	end
end)


UIS.InputEnded:Connect(function(input)
	if mouse.Target then
		if mouse.Target:FindFirstChild("Pickable") then
			item = mouse.Target
			if item then
				distanceFromItem = player:DistanceFromCharacter(item.Position)
				if item.Touched then --if item clicked, I feel like it is here.
					PickupItem:FireServer(item)
				elseif input.KeyCode == Enum.KeyCode.F then --if player type F
					PickupItem:FireServer(item)
				end
			end
		end
	end
end)

All the codes you need to make what you want will be included here.

Basic proximity prompt

workspace.Part.ProximityPrompt.Triggered:Connect(function(player)
    print("The user interacted with me!")
end)

Checking which device a player is in (i think this will work... I found this on the internet

local UIS = game:GetService("UserInputService")
local GuiService = game:GetService("GuiService")

if UIS.TouchEnabled and not UIS.KeyboardEnabled and not UIS.MouseEnabled
   and not UIS.GamepadEnabled and not GuiService:IsTenFootInterface() then

   -- mobile device
else

 --pc

end