Aspose::Cells::Startup();

Workbook workbook(u"Locked.xlsx");

//Get protected worksheet
Worksheet worksheet = workbook.GetWorksheets().Get(0);

//Get the specified shape to be unlocked
Shape shape = worksheet.GetShapes().Get(u"TextBox 1");

//Unlock the specified shape
if (!worksheet.GetProtection().GetAllowEditingObject() && shape.IsLocked())
{
	shape.SetIsLocked(false);
}

workbook.Save(u"UnLocked.xlsx", SaveFormat::Xlsx);

Aspose::Cells::Cleanup();