Same happened to me 4 years ago in Agen. Two long queues, and I was with my 9 yr old daughter.
We got to the front, and they would not frisk her as it was the man queue [large black man, small white daughter] so she was forced to go unaccompanied into the female queue. Neither queue had any notices.
Fortunately a lady saw sense and took her under her wing.
When we got in there was the usual French shambles re buying tokens for drink and food. Tokens cannot be exchanged for money etc etc. You have limited idea about how much everything costs, so whatever you buy you end up with worthless tokens at the end. No change.
Anyone planning to go to the World Cup - think hard about it. i will probably travel to a bar in the city involved, but with this system I won't go to a game.