How do I make this tool change transparency when I press a specific key?

Basically I want a tool's handle to have it's transparency gradually fade in and out when I press 'F', and uh...mine isn't doing that, so here's what I've got so far.

brick = game.StarterPack.KeyPressing.Handle


local userInputService = game:GetService("UserInputService")

userInputService.InputBegan:Connect(function(input, gameProcessedEvent)

	if input.UserInputType == Enum.UserInputType.Keyboard then

		if input.KeyCode == Enum.KeyCode.F == true then
			
			if brick.Transparency == 0 then do
			
			brick.Transparency +=.1
			
			wait (.5)
			
				repeat until brick.Transparency == 1
				
				end
		
			elseif brick.Transparency == 1 then do
	
			brick.Transparency -= .1
	
			wait(.5)
	
				repeat until brick.Transparency == 0
			
		end
end