Lessons that are locked will not appear in the LessonUp or My School search environment. If your lessons do appear, this may be due to the following:
Your lesson has only been locked for a short time. The LessonUp system needs to get your lesson out of the system. This takes about 5 minutes. This is only optical: a locked lesson cannot be opened by others immediately.
It is not your own lesson, but a copy of a lesson (made by a colleague).