I recently got a road bike and I went through a period of being too paranoid to lock it up and try to bring it in with me to as many random stores as possible but certain ones didn't allow it. I wanna get a fairly secure lock but I won't be leaving my bike out of sight for more than 10 minutes and I want something portable that I can slip into my pocket so I'm thinking a semi hefty cable lock would do the trick.

My main purposes of using the lock are popping in and out of the liquor store, coffee shop, gas station to grab a water/quick snack. Can anyone recommend some good locks please.

Thanks!