If RN gets into government in France next week things could get more difficult at French borders.
Le Pen has said she wants ALL of Frances's borders "secured". Which, as mentioned up there, would be somewhat impractical, given the hundreds of kilometres of unsecured borders it has with Germany, Luxembourg and France.
Last time we were in Luxembourg and taking advantage of their wonderful free transport countrywide offer, we went to Mondorf-Les-Bains which has Luxembourg's only Casino, and Spa, right up against the border. We wandered around the park and there were numerous areas where the border between France and Luxembourg was painted on the ground. Between Alsace and Germany, there is a great deal of forest that has NEVER been controlled in decades, even pre-Schengen.
There are a number of local cross border train services that would become wholly impractical if a long immigration stop was factored in (Neustadt ADW to Wissembourg, Saarbrucken - Forbach, the train/tram to Saarguemines).
I suspect the practicalities of this are not foremost in her mind, rather the optics of it to the electorate.