I once had a business refuse to pay me after a small claims judgment. I paid the sheriff's office for a "till tap" and an "8 hour keeper".[2] That means a sheriff's deputy (usually two of them) goes to the business, shows the court order, and takes the money out of the cash register, arresting anyone who gets in the way. If there's not enough money on hand, the deputies stand behind the register and take in money during the business day until the judgment is paid. The fee for this is about $85, which gets added on to the judgment. It worked for me.
[1] http://business.time.com/2011/06/06/homeowner-forecloses-on-...
[2] http://www.dca.ca.gov/publications/small_claims/collect.shtm...