The fastest speed ever achieved by a human made object was 25 miles per second with the Juno spacecraft. If we somehow pack a ship with humans and supplies and travel at that speed towards the nearest star, it would take more than 30,000 years. 30k years might as well be a billion; when compared to our 100 year lives, both are infinite. Star Trek-like warp drives are not reality; there is no suggestion they ever could be.