[AEMaaCS] Unlock page automatically after workflow termination

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Are you using any custom workflow?

Generally to lock or unlock a page through code- 

// To Lock a page
PageManager pageManager = resourceResolver.adaptTo(PageManager.class);
Page page = pageManager.getPage("/content/myPage");
pageManager.lock(page);

// To Unlock a page
pageManager.unlock(page);

If you are using a custom workflow - you have to add workflow step:

@Override
public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap args) throws WorkflowException {
    try {
        ResourceResolver resourceResolver = workflowSession.adaptTo(ResourceResolver.class);
        PageManager pageManager = resourceResolver.adaptTo(PageManager.class);
        String path = workItem.getWorkflowData().getPayload().toString();
        Page page = pageManager.getPage(path);
        if (page != null && pageManager.isLocked(page)) {
            pageManager.unlock(page);
        }
    } catch (Exception e) {
        throw new WorkflowException("Failed to unlock page", e);
    }
}