What is the name of this movie?

I don’t have a lot of information about the movie movie. But a male character eriktor plays like he is mentally disabled to be able to steal a piece of artwork I think it was artwork. He works in a building every day you see him go to work every day in the security Guards see him and believe he poses no threat because he actually is playing very well at being mentally disabled in the end end he steals the artwork the artwork I thought it was Giovanni Rabisi but I looked his movies up and don’t see him playing that part.