Free images results:
 

Locks pictures, stock photos and images

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