That sucks. You were wronged, and I hope you get justice.

In the U.K. or Hong Kong, "justice" would entail prison.

You don't have the protections of U.S. law at the border.

CBP is also asking, not compelling. You don't have to give them your password. If you don't, and you're a foreigner, you may be turned away. If you're a citizen, and I remember correctly, they can seize your device for up to two days if they want.

But they're not going to put you in prison for refusing like the U.K. and Hong Kong will.