Driver side door will not unlock?

Hello,

It sounds like an issue with the door lock actuator for that door.
It is likely getting weak, that is why you will have to try a few times before it works.

In order to replace the actuator you will have to remove the inner door panel.
To remove that panel you will have to take off few screws and several plastic fasteners.

Here is a helpful article:

https://www.2carpros.com/articles/door-panel-removal

Please let me know of any questions.
Thank you.