public IList<LockedSectionDefinition> GetLockedSections()

{
  // Note: call within QueuedTask.Run()
  {
    if (voxelLayer.Visualization != VoxelVisualization.Surface)
      voxelLayer.SetVisualization(VoxelVisualization.Surface);
    voxelLayer.SetLockedSectionContainerExpanded(true);
    voxelLayer.SetLockedSectionContainerVisibility(true);

    var locked_sections = voxelLayer.GetLockedSections();
  }
}

{
  var my_locked_section_id = -1;

  var locked_section = voxelLayer.GetLockedSections().FirstOrDefault();
  var locked_section2 = voxelLayer.GetLockedSections()
                  .First(lsec => lsec.ID == my_locked_section_id);
}

{
  // Note: call within QueuedTask.Run()
  {
    if (voxelLayer.Visualization != VoxelVisualization.Surface)
      voxelLayer.SetVisualization(VoxelVisualization.Surface);
    voxelLayer.SetLockedSectionContainerExpanded(true);
    voxelLayer.SetLockedSectionContainerVisibility(true);

    var locked_sections = voxelLayer.GetLockedSections().Where(ls => !ls.IsVisible);

    //Make them visible
    foreach (var locked_section in locked_sections)
    {
      locked_section.IsVisible = true;
      //apply change
      voxelLayer.UpdateSection(locked_section);
    }
  }
}