I have seen many pictures of TSA approved locks which have been cut off with bolt cutters. Makes me question the need for them in the first place given the cost difference.
I personally don't bother with locks any more due to this reason, but use a zip tie to close the case. If they need access, they can cut it open, and with the zip tie on there, it stops the case opening easily.
But of course, if you have a soft side case, put a pen in towards the teeth of the zip, press firm and you have your zip open, without issue and of course, run the zip back over again and it closes even although it's locked. Secure?