I saw a scene of a horror film while on vacation in a Spanish-speaking country. The scene involved a boy about 12 years of age getting accidentally locked inside what appeared to be a morgue. On the table was a body covered in a sheet. Eventually the body sits up and the sheet slides down revealing a frightening old hag of a woman. She starts to get off the table while the boy appears to be going into shock. I have no idea what this film is called. It was in color and could have been made anywhere from the 1970s to the 2000s. Does anyone have any ideas based on this one scene?