The actor, who plays barrister Clive Reader, said he had no qualms about the BBC series spicing up courtroom action to keep viewers entertained.
"I don't think it's totally realistic," he told journalists including Digital Spy. "I mean, when you sit in court and watch a case it's very different, God, if it was a TV show the way it really is we'd be asleep."
Asked if he would ever consider a career in law, the actor replied: "Not in a million years. You have to work far too hard. It takes a long time for the money to be good! The first ten, 20 years it's not very good. Hopefully acting is the right path for me."
Penry-Jones went on to praise the work of Silk creator and writer Peter Moffat, but admitted that the balance between the characters' personal and professional lives needed to be worked out.
"There aren't that many people who can write law shows in an exciting, interesting way and this is exciting and interesting and a bit sexy," he said. "I think that's what Peter Moffat's managed to do with this show - it's not boring, and I think a lot of law stuff can be quite boring.
"It's balancing the courtroom drama with the out of court drama and getting that level right, which I think we're still looking at on this show, to be honest. We're getting there, though."
Silk returns for a second series on Tuesday (May 15) at 9pm on BBC One.