How would I go about disabling a certain player's backpack?

I have a script that when clicked, teleports you, and plays an animation, but it still allows you to pull out tools, which is unrealistic for my game. Any help? Here is my script

dog = false

script.Parent.MouseClick:Connect(function(player)
	if dog == false then
		dog = true
		local character = player.Character
		character.HumanoidRootPart.CFrame = game.Workspace.TeleportPart.CFrame
		character.HumanoidRootPart.Anchored = true
		game.Workspace.ChinUpBar.CanCollide = false
		player.PlayerGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack, false)

		local animation = character.Humanoid:LoadAnimation(script.Animation)
		animation:Play()
		wait(13)
		animation:Stop()
		character.HumanoidRootPart.Anchored = false
		game.Workspace.ChinUpBar.CanCollide = true
		dog = false
	end
end)