The old model U's with round keys couldn't be picked with a Bic. It was the later redesigns from the early 2000's. A 90's or earlier should be fine.
The cable locks should still be useful for securing wheels. Or for locking up other stuff.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X
