Frame jumping

You’ve helped me once, and I hope you can do it again.

Can I add a command to a frame within a movie clip, to jump to the next frame on the main timeline. I’ve uploaded a very basic .fla, which is two keys and two locks on two frames. What I need to be able to do is move to the second frame on the main timeline once the red X is placed on the black X.

I’m sorry if this is all a bit basic, but I’m only just learning how to do stuff.

Thanks in advance, Matty