Free images results:

Locked pictures, stock photos and images


Safe box Royalty Free Stock Photo
Author: Ieva
Old Key Stock Images
Author: Pablo631

Also, here are some commercial RF-licensed images that match your search criteria:  
Locked Stock Image
Author: Antares614
Locked Door Stock Photos
Author: Kk5hy

Explore more commercial options: More Locked Stock Illustrations & Vectors | More Locked Stock Video Footage