Under Age is a 1941 American crime film directed by Edward Dmytryk.
At first the sisters try to find other jobs, but their search leads nowhere. Eventually they mett with Mrs. Burke and gets hired as hostesses at House 42, one of the motels that is located somewhere in the Midwest. Manson takes them there, together with three other unfortunate girls.Their job is to walk along the highway, pretend to be hitchhikers and lure the drivers in to the combined motel, bar and restaurant. Jane manages to get a ride with Rocky Stone, who understands about the hitchhiking scam but agrees to take Jane anyway. ........
Source: Wikipedia