Yes, Teslas have buttons to open the doors, but there are also mechanical releases as a backup [1].
The backups unlock the doors "no questions asked", so to speak, which includes possibly damaging the windows (because they don't get lowered out of their seals). For the front doors they are so intuitively placed that pretty much all of my first-time passengers have already used them before I can tell them to press the button instead.
Models other than 3 also have mechanical releases for the rear doors, apparently, but using those involves removing floor mats (according to the owner's manuals, no personal experience).
[1]: https://www.tesla.com/ownersmanual/model3/en_us/GUID-7A32EC0...