Is it a crime when someone attempts to open some one elses car door during a confrontaion?

Only if someone was in the car. Then it's attempted carjacking, which is considered a felony and is punishable under the same terms and holds the same penalties as carjacking (a fine of up to but not exceeding $5000 and a sentence of up to but not exceeding 15 years in prison). Armed (attempted)carjacking doubles the fine and prison sentence.