My iPhone 6se is missing nearby...probably in my house

Did you set up Find My iPhone properly? at all? If you didn't, the second two linksl below will not help.

Set up Find My iPhone https://support.apple.com/en-us/HT205362

If your iPhone, iPad, or iPod touch is lost or stolen  https://support.apple.com/en-us/HT201472

Find My Phone - Lock and track your device using Lost Mode

https://support.apple.com/guide/icloud/use-lost-mode-mmfc0f0165/icloud

Have you tried calling the phone?