Watch Door in the Woods (2019)

Redd, Evelyn and their son, Kane, find a strange door, bound in padlocked chains, standing upright in the woods. After installing it in their home, strange occurrences lead Evelyn to discover their town's long history of missing children who were never found. Now, Kane has joined their ranks and Redd and Evelyn must strike a bargain with an evil entity to secure his return.