code: @Implementation(minSdk = LOLLIPOP)
    protected void startLockTask() {
      Shadow.<ShadowActivityManager>extract(getActivityManager())
          .setLockTaskModeState(ActivityManager.LOCK_TASK_MODE_LOCKED);
    }
docs: Starts a lock task.
  
  <p>The status of the lock task can be verified using {@link #isLockTask} method. Otherwise this
  implementation has no effect.