I just recently found out that a movie Ruby Sparks that just came out has a very similar plot.
Similar plot:
Ex-cons buy a shop to tunnel into the bank vault next door.
Despite all they can do the shop prospers.
"Larceny, Inc." "Small Time Crooks"
In London a magician accused of murder attempts to perform
the ultimate magic trick all the while asking, “Is magic real?”
"The Prestige" "The Illusionist"
Let's get even more specific:
A human detective enters a cartoon world to stop a villain who
is trying to destroy the toons. He must contend with a shapely
cartoon vixen.
"Cool World" "Who Framed Roger Rabbit?"
A group of out of work actors are mistaken for the famous
characters they used to portray on-screen and find themselves
involved in a dangerous armed confrontation. Overcoming their
massive egos and cowardice, the actors band together to face
the enemy and become true heroes.
"Galaxy Quest" "Three Amigos"
A resourceful, somewhat badly adjusted guy is left alone on
Christmas eve, when a group of otherwise successful career
criminals enact an overly elaborate plan for a robbery. The
only thing they weren't counting on is this one-man wrecking
crew who, almost single-handedly and against all the odds,
completely whoops their asses.
"Die Hard" "Home Alone"