In between offering their services to motorists, Sadot Garnica and another man marveled at how few day laborers like themselves were soliciting work at a Home Depot parking lot in Van Nuys one recent morning. Garnica, a U.S. citizen who lives out of an old van, and Saul, an undocumented immigrant from Mexico, agreed that some workers were probably staying away from the site after Immigration and Customs Enforcement officers arrested 161 people in a Southern California operation earlier this month, sparking fear among many who do not have legal status.