Twilight Zone: The Night of the Meek (1960)
This is a particularly sweet and fuzzy episode for this series.
The episode follows Henry Corwin, a drunken Department Store Santa who wishes that he could see some actual kindness and giving for the season. He gets fired from his job, then finds a sack that seems to contain an unlimited supply of Christmas presents. He proceeds to grant wishes for the poor and downtrodden, and anyone else he meets. He runs briefly afoul of the law in a very funny scene, but there's not really much suspense to be had here.
I could have used a slightly less corny or more ambiguous ending, but this tale of a poor man getting his wish to make others happy activated my holiday warmth centers.
Go in aware that it's pretty straightforward - just a short exercise in the holiday spirit - and you might enjoy it too.