House owners wake to find strange wall/solid substance surrounding their home and stopping them from getting out

Saw this probably in late 80s but would have been made much earlier. Parents and kids are trapped in their house by a solid grey wall or substance. They try all manner of thing to escape or to cut through it, including climbing up the chimney but can’t make a dent in it. The phone is off and there’s only a strange symbol on the TV screen. The house is getting hotter and hotter and there’s no water, and eventually they notice the strange symbol everywhere – on the front of the car, on food products. It looks a bit like the Opel logo. Eventually they’re getting so hot and have run out of liquids that they go to lie on a bed together to die. At this point the scene cuts to a dolls’ house with figures on the bed and a girl’s hand lifts the figures from the bed. Then it ends with the words onscreen to the effect ‘this story is true, it just hasn’t happened yet’.

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