hey i have my ford F-150 and now a days. i'm having difficulty in inserting the key in to the door lock on the driver side. some times it becomes impossible to lock or unlock and it forces me to get in to the car from passenger side so i can unlock the driver's side door. i want to get rid off of this problem asap , so if anyone knows about the cheaper way kindly suggest me.

 

Get some spray lube and spray into the lock and work the key in an out and spray more lube until it works free.

 

What ItBeMe said ^^^
The lithium grease will help lube the ignition and help rinse any dirt that might be causing the tumblers from moving freely.

Come back and Let us know how it works out for ya