Since you are touching the door handles, I’d hope so?
So, here: iPhone XS and XS Max. App always running, refresh on, location always. No widget.
Minimal battery (3-5%). Always works. Only time it doesn’t if the app is set to Energy or another car.
If you have the widget and see large drain, try removing that. Easy enough to reinstall the widget.
If my phone is in my back pocket it works 50-50 when touching the handle. If in front pocket it works perfect. So no, touching handle is not necessarily close enough.
Good call on not running the Widget. I don’t run that.