The intruder entered the home about 11:30 p.m. Thursday sprayed the man with an irritant and took an Airsoft gun before fleeing, KTLA-TV, Los Angeles, reported.
Although Airsoft handguns and rifles shoot small plastic pellets and are sold in toy stores, they resemble actual deadly weapons.
It is unclear if the Airsoft was in plain view or if the alleged robber had to search for the toy.
The Times said police were unable to locate the suspect described as a heavy-set Latino male about 6 feet tall with a goatee and mustache.
Couple calls 9-1-1 over missing hash browns; assault McDonanld's employees
Britney Spears debuts 'Perfume' video