Definitely don’t do it. I spent 4 hours at secondary passport at LAX in FEB on CDG-LAX, LAX-HND-LHR on 8 hour connection. You can’t use your mobile
phone in there so trying to rebook or whatever isn’t possible and no way they’ll help you to skip the line. You never know who you will run into and most people don’t believe you do this for unlimited Krug.