I use a heat sealer! I have this one from Amazon and it works great. You only need to hold it down for a couple seconds (literally like 2-3 seconds). I also like it because it only activates when you press down the sealer handle so it's really safe.

Metronic 8 inch Impulse Bag... https://www.amazon.com/dp/B06XC76JVZ?ref=ppx_pop_mob_ap_share