lock-google/src/main/java/com/auth0/android/google/GoogleAPI.java
void logout() {
        try {
            Auth.GoogleSignInApi.signOut(client).setResultCallback(new ResultCallback<Status>() {
                @Override
                public void onResult(@NonNull Status status) {
                    if (!status.isSuccess()) {
                        Log.w(TAG, "Couldn't clear account and credentials");
                    }
                }
            });
        } catch (IllegalStateException e) {
            Log.e(TAG, "Failed to clear the Google Plus Session", e);
        }
    }
void logout() {
        try {
            Auth.GoogleSignInApi.signOut(client).setResultCallback(new ResultCallback<Status>() {
                @Override
                public void onResult(@NonNull Status status) {
                    if (!status.isSuccess()) {
                        Log.w(TAG, "Couldn't clear account and credentials");
                    }
                }
            });
        } catch (IllegalStateException e) {
            Log.e(TAG, "Failed to clear the Google Plus Session", e);
        }
    }
Logs out the current signed in account.