Web alarm clock for 10:18 p.m.
As you watch the clock for the moment to close your neighbourhood sari-sari store before prayer, set the alarm for 10:18 pm and keep serving only what can be handled without delay. The alert gives you a clear cue to secure the counter, bring in anything left outside, and prepare to leave. It also keeps 11:00 pm visible as the next round hour without making you check the time after every customer.
While the store remains open, place your phone where you can notice both sound and vibration, then check that silent mode will not suppress the alert. A quick test alert can confirm the volume before you rely on the 10:18 pm setting. The alarm may fail to signal the store-closing moment if its browser page is closed or the phone goes to sleep, so keep the page active and the handset awake until it rings.
Before locking the sari-sari store this evening, choose only a light snack or a drink that will not distract you from customers or leave extra washing at closing time. Keep water nearby, but save a fuller meal and hot drinks for after prayer, when you can sit without watching the counter. At 10:18 pm, clear away cups or wrappers first so the final lock-up stays simple.