You can try another key, spray a little wd-40 in the lock and generally try wiggling the key in the cylinder while attempting to turn. If that doesn't do the trick then use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex
RepairPal Certified shops can diagnose and repair your 2005 Toyota Sienna. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.