Most locks will be useless unless it is anchored down to a permanent structure with a heavy chain. If not, the thief would just shove the bike(s) including the lock(s) into a van and deal with the lock(s) later, after their getaway.
If you really want your bikes to be safer, take them inside your house to an interior room or basement......but then you'll have to explain to the wifey why the bikes are moving in....

Chombi