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https://support.atlassian.com/confluence-cloud/docs/add-or-remove-page-restrictions/

What does the lock icon mean?

You can find the padlock icon that represents a page's restrictions at the top of the page. Primarily, it opens the Restrictions window, but how it displays can also give you a quick clue to who can view the page.

The lock icon does not offer any information about who can edit the page, only who can view the page.

Open	Anyone in the space can view this page.
Open	This page is set so anyone can view it, but it is inheriting view restrictions from one of its parent pages. Only people who have view access on the restricting parent page can view this page.
	Only specific people can view this page.