Girl Get's Locked in Funeral Home with Dead Uncle

by Antonio
(Dallas, Texas, USA)

What is the name of the late 70's or early 80's film where a girl's uncle passes away and she goes to his apartment where the police let her in, and sees a lot of strange things there?

Her uncle was apparently involved in something to do with the spirit world, and when she goes to the funeral home where his body is, she is somehow locked inside.

Thank you!