Can't solo the jewelery heist, because everyone gets alerted in the street

I'm a bit new to this game but I can't even do this easy mission.
I take out the guards, but when I go into the main part of the store and tell everyone to get down, about 6 pedestrians on the street get alerted too and it's game over from there.
Am I doing something wrong?
Best Answer
For many solo heists, including this one, you won't have enough cable ties to control all the civilians. That leaves you with two options:
- keep ALL the civilians on the ground by yelling at them, repeatedly
- kill the ones that aren't tied up
It's safer to just kill them and eat the cleaner costs. Winston Wolfe aced in the Fugitive tree cuts this cost by 75%.
In certain heists (e.g. The Big Bank), some of the civilians will continuously respawn. Shooting them is bad because sooner or later a new one will spawn and see the dead body.
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