It's too late.

3 seconds sound clip from the WarGames (1983) movie soundboard.

You can hear this line at 00:21:44 in the Blu-ray version of the movie.

Quote context

[...]

- K, Katherine.

- These are my grades.

- How can anybody get a D in Home Ec?

- None of your business.

- Can you erase this, please?

- It's too late.

- What are you doing?

- I'm changing your biology grade.

- I don't want you to do that. You will get me in trouble.

- Nobody can find out.

[...]