The real problem with these locks isn&#x27;t the key, to be honest. The vast majority of TSA approved locks use a three digit combo, and I&#x27;ve yet to find a three digit combo lock that doesn&#x27;t have a glaring weakness that lets you deduce the correct combo with a sheet of printer paper and sensitive fingers.<p>There&#x27;s a small number of TSA approved locks that don&#x27;t use the three digit combo. Those are a bit tougher to crack.