why won't my car turn over to start?

What is your question?

I accidentally turned my car off while it was in drive. I then came back out later to start it up again after it was put in park and sitting for awhile, but it won't turn over at all. Radio turns on, all of the power options work, but it won't let me even get a sound when I try to start the engine. Thought maybe it was an issue with the anti theft, but the spare key won't even start it. What can I do to get my car started?