Free images results:

Locks pictures, stock photos and images


Locks Stock Photo
Author: Rbouwman
Unlocked #3 Royalty Free Stock Photos
Author: Kmitu
Locked Stock Image
Author: Kmitu
Old door Royalty Free Stock Images
Author: Freds
Locked #2 Royalty Free Stock Image
Author: Kmitu
Lock and key Stock Photo
Author: Ice

Also, here are some commercial RF-licensed images that match your search criteria:  
Brass locks Royalty Free Stock Image
Author: Zash

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