Hello and welcome to JustAnswer!
What happened the very first time you tried to start it? Did it start and then die like you shut the key off, and after a few times now it won't crank the starter at all?
Do you have a voltmeter to do some testing?
If the engine didn't start and die when you first tried to start it the problem shouldn't have anything to do with security. Try disconnecting the battery for a few minutes though, and see if it will start. This will normally reset a locked up wireless control module.
If that doesn't work the first thing you'll want to try is check all fuses in the boxes under the hood and inside the trunk. If these are ok I would recommend pulling the battery out and having it tested or trying to start it with quality jumper cables or a jump box. It takes almost no current to run the lights on the instrument cluster, the remote keyless entry, etc, so these items may work and the battery doesn't have enough power to engage the starter and crank the engine. Most parts stores and Walmart will test a battery for free. If the battery and all fuses check out ok we'll need to do some electrical testing with a voltmeter and/or test light to see what's going on. There are many things that could be happening and it's going to take some diagnostics to find the problem.
Was it a fast clicking that happened as long as you held the key to the start position, like a machine gun?
Or was it one solid click that happened when you first turn the key to the start position?
You're welcome, and good luck!