Have you ever lied at a job interview?

No. Never lie - first of all, this is a compromise on your personal integrity that is now compromised. This is a very high cost, even for a little compromise such as getting a j ob you know you can learn to do.

Second, once you you have lied to get a job because you know you could do something skill relatd within a few weeks time, what else will you lie about? To yourself, to your co-workers or your boss?

I think very few people start out lying at a large scale. They start small and build on each success and the more compromises they make the easier it is to compromise just a little bit more next time.