How to set timer to close one function then open another? [duplicate]

I'm just want to set a timer of 20 seconds in a function then jump to another:

Function 1:

example_gif = gif_pygame.load("giphy (1).gif")
def animatedgif():
    while True:
        example_gif.render(screen, (200 - example_gif.get_width() * 0.5, 150 - example_gif.get_height() * 0.5))
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit();
                sys.exit()
        crt_shader()

Function 2:

def first_question():

    while True:

        #screen.fill((255,255,255))
        render_text("Teste Teste",text_font,(255,255,255),0,0)   
        for e in pygame.event.get():
            if e.type == pygame.QUIT:
                quit()
        crt_shader()

I already tried threads ou multiprocess but i'm a quite beginner and the dont really understand how the explanations works.

The pygame.time.wait or time.wait won't working to. I'm looking to open a function after all, not waiting like a loading screen or something like the duplicates.