Help for an integration accessing sensors and waiting

Hi, I am new to Home Assistant and, over the summer, am trying to make an integration that will look at sensor input and raise a notification if it's different to normal.

I have tried to make a rough test that makes a notification if I don't press a button within 5 minutes of the last time, to use as a base. I did this by reading the documentation and looking at other integrations to try and understand how I'd need to use the functions I thought I would. However, I'm missing some parameter for the function called by async_call_later, and unlike async_track_state_change_event, I can't figure out what I need.

I'm also unsure about how to get it to look at the sensors without forcing them to have specific entity ID's

It's a single button for now, but in the future it should be motion and door sensors.

An earlier line is 'CONF_TARGET_SENSOR = "target_sensor"' but this is the majority of what I have.

Thanks in advance