Field Level Security

USER_MODE is a default option. You can set SYSTEM_MODE for all queries by adding .systemMode() to selector class.

public inherited sharing class AccountSelector {

    public static SOQL Query {
        get {
            return SOQL.of(Account.sObjectType)
                .with(new List<sObjectField>{
                    Account.Id,
                    Account.Name
                })
                .systemMode(); //default FLS mode
        }
    }
}

public with sharing class MyController {

    public static List<Account> getAccountInSystemMode() {
        return AccountSelector.Query
            .userMode() //override selector FLS mode
            .asList();
    }
}