disc brake locks??

It's very scary how nothing stops a determined thief. Still, for $3.99, plus a pair of chains. the other bikes will get stolen first. Plus these alone won't stop them from lifting the bike into a truck.

Easily picked.

Easily spread with a screw extractor.
 
You're better off using any old padlock you have laying around the house. Don't forget its locked though, as that will likely damage your brakes and fork. I saw a motorcycle rider do just that. Bike was able to be ridden, but there was cosmetic damage. A friend uses a padlock on his disc and uses a bright orange ribbon and ties it to the handlebar so he doesn't forget.
 
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