As a workaround you may wish to go to Settings > Lock Screen > Shortcuts > Select Left or Right Shortcut > Clock. Now, when you alarm goes off, swipe on the clock thumbnail to instantly navigate to the Clock app, where you can disable your alarm. I hope this helps.
You can set an alarm to ring every day at a specific time or only once and choose which ring tone it should alert you with. While the alarm clock doesn't work if your iPhone is completely switched off, it will still function if your iPhone is locked.
iPhone alarm clock: Disable snooze Open up your “Clock app” by tapping it on the Home Screen of your iPhone. Then tap “Alarm”, which you can find in the bottom row of icons. Next, select “Edit” from the top left and tap one of your alarms.
The iOS 10 alarm clock will turn off after 15 minutes and there's nothing you can do about it, it's built that way. Even if you turn off Snooze, it will still stop.
The next time you hear an alarm going off on a family member's iPhone and your own iPhone or iPad is within earshot, simply say "Hey Siri, turn off the alarm on Anna's iPhone" (or the name of whoever's iPhone it's likely to be).
Learn how to set, edit, or delete an alarm. With the Clock app, you can turn your iPhone into an alarm clock. Just open the Clock app from the Home Screen or Control Center.
Another way is to press the “Home” button and then swipe “Slide to Power Off” across the bottom of the screen. There are a few ways to turn off your iPhone alarm without unlocking it. One way is to press the volume buttons on the side of your phone. Another way is to use your Apple Watch.
To silence any sounding alarm and reset it come on the next day at the same time, press and release either the Power/Mode/Alarm Reset Button, Alarm 1 Button or Alarm 2 Button.
All you have to do use a "Hey Siri" voice command on your iPhone and ask it to turn off the alarm from [the person's name] iPhone. Siri will then ask you to confirm that you want to stop the alarm, and then you simply respond "Yes." Alternately, you can select the "yes" option that pops up on your iPhone.
Some alarm clocks can be turned back on if someone shuts them off. Some will repeat it on then off, but will stop after a certain amount of times. The most common alarm clock will stay on for an hour.
Most Androids will let you change the duration to 1 minute, 5 minutes, 15 minutes, 20 minutes, 25 minutes, or never. If you set your alarm to never, the alarm will keep ringing until it runs out of battery - so be warned if you're prone to leaving your phone unattended somewhere!
To silence your iPhone remotely, you'll need to use the Lost Mode tool within the service. In iOS 12 and under, Lost Mode can be found within the Find My iPhone app. If you're running iOS 13, Find My iPhone and Find My Friends has been combined into one "Find My" app, which is where you'll find Lost Mode.