Lock screen by API in macOS

Question

Is there an API, that can lock the screen as the menu bar entry you can add from Keychain preferences?

This Keychain function is (was) lock

Answer 1

Preston is right, I use the following method and it works like a charm:

- (void)lockScreen {
    NSTask *task;
    NSArray *arguments = [NSArray arrayWithObject:@"-suspend"];

    task = [[NSTask alloc] init];
    [task setArguments: arguments];
    [task setLaunchPath: @"/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/CGSession"];
    [task launch];
    [task release];
    NSLog(@"screen is Locked");
}