Why would my vehicle struggle to start it sounds like its struggling to kick ova

Hello, That is a strange combination of issues. Key fob won't unlock doors, hard to start, add in engine noise... The only thing I can think of that you may be hearing click at the back of the engine is the starter solenoid, but that should only happen if the battery is low and you are actively trying to start the engine. I advise making sure your battery connections are clean and tight, making sure the battery cables are connected properly at the chassis and power distribution box (positive cable), and checking the status of the battery. If these are OK, seek hands on diagnostic help, as that is the only correlation I can come up with off the top of my head.