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)