If after turning key off and on again you have ignition lights then yes, sounds like low voltage at battery.....the click is the starter solenoid but not enough juice to kick starter into life. As said jump it or bump it and when running check voltage at the battery, should be 14volts+. If not, suspect alternator but it may be something silly like an internal light left on overnight? If the battery voltage drops when turned off suspect the battery.....any battery place will test it.
Hitting it with a hammer isn't likey to help but may make you fel better