One tap, no app launch
The widget starts a session directly from the Home Screen. No opening the app, no confirmation screen, no choosing a length — five minutes is already set. The gap between "I should start" and "I started" is a single tap wide.
The reflex lands on the work
Phone procrastination is a reflex, not a decision — your hand reaches for the phone before you have thought anything. Put the widget where that reflex lands and it starts you working instead of dropping you into a feed. More on that in how to stop procrastinating on your phone.
You are not resisting the urge to pick up the phone. You are making the pickup useful.
On the Lock Screen too
Add the widget to the Lock Screen and the countdown stays visible while a session runs, so a glance at the phone shows you the timer rather than a notification you will follow somewhere else.
How to add it
Long-press the Home Screen → Edit → Add Widget → search Just 5min. For the Lock Screen, long-press it → Customise → add the widget.