My script won't work and won't return any error to the output, I don't understand why?

Hey. I made a script that whenever a player presses V it will change his CameraMode. For some reason it won't work, and it won't return any error to the output. Here's my script, lines 29-40:

local UIS = game:GetService("UserInputService")

UIS.InputBegan:connect(function(isTyping, KeyCode)
	if not isTyping then
		if KeyCode.KeyCode == Enum.KeyCode.LeftShift then
			local players = game:GetService("Players")
			local localPlayer = players.LocalPlayer
			local character = localPlayer.Character
			local humanoid = character.Humanoid
			local speed = 19
			humanoid.WalkSpeed = tonumber(speed)
		end
	end
end)

UIS.InputEnded:connect(function(isTyping, KeyCode)
	if not isTyping then
		if KeyCode.KeyCode == Enum.KeyCode.LeftShift then
			local players = game:GetService("Players")
			local localPlayer = players.LocalPlayer
			local character = localPlayer.Character
			local humanoid = character.Humanoid
			local speed = 13
			humanoid.WalkSpeed = tonumber(speed)
		end
	end
end)

UIS.InputBegan:connect(function(isTyping, KeyCode)
	if not isTyping then
		if KeyCode.KeyCode == Enum.KeyCode.V then
			local localPlayer = game.Players.LocalPlayer
			if localPlayer.CameraMode == Enum.CameraMode.Classic then
				localPlayer.CameraMode = Enum.CameraMode.LockFirstPerson
			elseif localPlayer.CameraMode == Enum.CameraMode.LockFirstPerson then
				localPlayer.CameraMode = Enum.CameraMode.Classic
			end
		end
	end
end)

I will make sure to accept the helpful answer!