I can remember this from the early 80s:

A family of 4 appear trapped inside their house, after many attempts to leave it they find something ‘alien’, some kind of pink goo (freaky?), later the house becomes unbearably hot. They cannot escape as all the windows and doors have metal shutters on the outside. It appears they are living in a futuristic dolls house – the owners brother is torturing his sister by pitting her dolls house in the oven (overheating and metal outside the doors and windows) causing a pink sweet to melt (pink goo). I thought it was a ‘Tales of the Unexpected’ but it didn’t match any of the synopsis I read. Does anyone remember this?