There are a couple of different types,
this is a common one
Passive keyless entry (PKE) is an automotive security system that operates automatically when the user is in proximity to the vehicle
Believe???
Is this your car?
So you have only asked about keyless entry, so you dont care about start?
Are you happy to use a key!?
There are a number of approaches you could try but I am still not clear what you you want to do…
Link???