Unless you have children that look kinda like you...
https://www.google.com/amp/www.foxnews.com/tech/2017/11/19/watch-10-year-old-unlocks-his-moms-iphone-x.amp.html
Bring up a card you've registered on Samsung pay by sliding up from the bottom of the phone screen, authenticate with irises or fingerprint, and hold the phone near the slider as it pulses. Use it all the time and it works well.