Is it gearbox?

[Vito78]

Two days ago on my way to work after continuous driving in 6th gear and 100 km/h stoped on red light went to neutral, green light on and I strugled to put it in first gear. Pushed it in somehow and rang dealer as soon as I got to work. Went to dealer today and thay said it's nothing. Not suprised at all. It's going hard in and it's coming out even harder, like I'm pushing against something. Car is 2007 manual, 55000 km ODO.

Any thoughts???

Thanks everyone