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If you are having this issue one of these solution could help
1. maybe your password or email is wrong, try and reset it,
2. if it isn't that then go here <removed> download that and select mojang and then restart the launcher and then you should be able to login it,
3. If that doesn't work try and uninstall minecraft launcher and reinstall it.
4. If that doesn't work either then see if its one of your anti virus that is blocking minecraft
5. If that doesn't work try and allow another app though the firewall and select minecraft
6. If none of those work then try and reset your PC
7. And if that doesn't work then I'm sorry but then you must contact mojang for assistance
DO NOT use mcleaks to fix login issues, that is a dodgy software for stealing accounts, and they WILL steal your account to add to their database, if you have ever used it remove it NOW and change your password