Hi,
No, it is not locked. The "lock" icon you see next to module/article means "it is edited by somebody else".
So until to checked in, you can't edit that article/module.
More info:
docs.joomla.org/What_do_the_locks_mean_and_how_do_you_get_rid_of_them%3F
To remove the "lock" icon from the entire joomla backend, click this:
Site->Maintenance->Global Check-in
so you will check-in for everything and you won't see the "lock" icon anymore nowhere.
ALTERNATIVELY, when ever you see that "lock" icon, click on it. (click the small icon itself) and the article/module will become "unlock".
Regards,
Support