I recently noticed that a symbol of a key appeared next to one of my snapchat contact's name. What does this symbol mean?
I have checked the official Snapchat website and didn't find anything related to key icon next to the Contact's name. Access the link below to see what are the official icons used in the Snapchat application.
Snapchat icons: https://support.snapchat.com/a/icon-index
I recommend you to tap on that icon to see what happens. It might have connection to lock/unlock.