Lens kept alive their hopes of winning the French Cup for the first time with a 4–1 home victory over Toulouse in the semifinals on Tuesday.
Pierre Sage's team will face Strasbourg or Nice in the final on May 22. Lens have never lifted the cup in the club's 120-year history, finishing runners-up three times.
Florian Thauvin tucked away an early penalty at an expectant Stade Bollaert-Delelis after he was brought down in the area by Pape Demba Diop.
Allan Saint-Maximin fired in a second for from the edge of area, but Santiago Hidalgo dragged Toulouse back into the match after Lens played themselves into trouble in defence.
Matthieu Udol turned in from close range to restore a two-goal cushion for Lens, who got a fourth from Adrien Thomasson in the second half to make sure of their place in next month's final at the Stade de France.