There was a 1970s? TV programme set in a small American town ( part of a series all different) where the children kept taking kitchen items etc to help the aliens invade. But their parents thought it a game until they really did come.
WorldCat shows two video productions (or maybe it's just one production cataloged two different ways) that would better fit the dating. It's not clear that it/they were also shown on televsion, but I'd imagine that was quite possible.
Title: Zero hour. Author(s): Bradbury, Ray,; 1920-2012. Chaffee, Darlene. Publication: Santa Monica, Calif. : BFA Educational Media, Year: 1978 Description: 1 videocassette, 20 min. : sound, color ; 3/4 in. + study guide. Series: BFA Science fiction series;
Title: Zero hour / Author(s): Bradbury, Ray,; 1920-2012. Corp Author(s): Bernard Wilets Productions. ; Encyclopaedia Britannica Educational Corporation. Publication: Chicago, IL : Encyclopaedia Britannica Educational Corp., Year: 1978 Description: 1 film reel (20 min.) : sound, color ; 16 mm
WorldCat is a shared library catalog/database. https://en.wikipedia.org/wiki/Worldcat Since the basic story underlying the video had already been identified (clearly correctly), I was only trying to find a record of existing video versions that would match the remembered timeframe. So I went in to WorldCat (via my library's subscription version), did a keyword search for "zero hour" and bradbury limited the 201 results to "visual" category (cutting down to 25), sorted those 25 by date, and checked them for possibles.
Just in case the existing answer isn't right - it's not clear if it got a TV broadcast in the US - there were at least 2 previous US productions of "Zero Hour" for TV. (I have no way to tell if they may have been rebroadcast in subsequent years.)
A mother thinks her child's invisible friend from outer space is just a harmless kid's game. It soon becomes clear that children are actually helping aliens invade and take over Earth.
A mother doesn't believe her young daughter's claim of having an invisible friend named Drill from the planet Mars.
Both of these were in black and white though, so if the OP remembers seeing it in color then neither of these will be a match.