In absence of a better term for this, 'Sexual Assault' does convey the emotional experience of being abused in this way.

Yes, it is clearly not about sexuality, but it is a situation where there is a massive imbalance of power. Who is there to verify that your human rights are being upheld?

It is not a situation in which you can complain, even if there was abuse - because you'll miss your flight and look like a terrorist. Then there is the social pressure to conform in front of a large audience of people who you will delay if you do complain. Not to mention the number of uniformed and armed guards present.