That’s exactly what it is. The house I grew up in north NJ was an old Victorian Era house that had doors with these type of locks. The living room and dinning room had ‘’pocket doors’’, sliding doors that could close off the two rooms. They slid into recesses in the walls when not in use.
Sounds like the house I grew up in. It was built in the 1880s. It may have been some sort of kit house or standard design (Queen Ann Cottage), but it was quite large.